Knowledge (XXG)

Hectare

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measurements (e.g. Canada) required a resurvey when units of measure in legal descriptions relating to land were converted to metric units. Others, such as South Africa, published conversion factors which were to be used particularly "when preparing consolidation diagrams by compilation".
463:. In practice the hectare is fully derived from the SI, being equivalent to a square hectometre. It is widely used throughout the world for the measurement of large areas of land, and it is the legal unit of measure in domains concerned with land ownership, planning, and 690:(EEC) passed directive 71/354/EEC, which catalogued the units of measure that might be used within the Community. The units that were catalogued replicated the recommendations of the CGPM, supplemented by a few other units including the 2068:
Robinson's Progressive Practical Arithmetic: Containing the Theory of Numbers in Connection with Concise Analytic and Synthetic Methods of Solution, and Designed as a Complete Text-book on this Science for Common Schools and
2039: 278:
was not included as a recognised unit. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though the dekare/decare
502:
In many countries, metrification redefined or clarified existing measures in terms of metric units. The following legacy units of area have been redefined as being equal to one hectare:
2043: 1950:[The law of 18 Germanial year 3 "The measure of land area equivalent to a ten-metre square"] (in French). Le CIV (Centre d'Instruction de Vilgénis) – Forum des Anciens 1622:"Council Directive 80/181/EEC of 20 December 1979 on the approximation of the laws of the Member States relating to Unit of measurement and on the repeal of Directive 71/354/EEC" 1751: 672: 1643: 1715: 207:
sides (1 hm), that is, 10,000 square metres (10,000 m), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An
2017: 2757: 1833: 1970: 2260: 1779: 1506:"Department for Environment, Food and Rural Affairs, and Rural Payments Agency; The Delays in Administering the 2005 Single Payment Scheme in England" 1926: 1522: 603:
In Mexico, land area measurements are commonly given as combinations of hectares, ares, and centiares. These are commonly written separated by a
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in the 2019 edition of the SI brochure, but classifies the hectare as a "Non-SI unit accepted for use with the International System of Units".
1948:"La loi du 18 Germinal an 3 " la mesure [républicaine] de superficie pour les terrains, égale à un carré de dix mètres de côté »" 2321: 2446: 1305: 858:(SI). It is still commonly used in speech to measure real estate, in particular in Indonesia, India, and in various European countries. 298: 2040:"Council Directive of 18 October 1971 on the approximation of laws of the member states relating to units of measurement, (71/354/EEC)" 1762: 2473: 1442:
block, is intended for compatibility with pre-existing East Asian character codes. It is not intended for use in alphabetic contexts.
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as a measure of land area. The names of the older land measures of similar size are usually used, redefined as exactly one decare:
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Two categories of rent, fixed and proportional, are payable to the state by mine-owners. The fixed rent is 10 piastres per
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plots or small city parks where the hectare would be too large. Many Russian dachas are 6 ares in size (in Russian,
2150: 1856: 624: 487:(since 1970). However, the United Kingdom, the United States, Myanmar (Burma), and to some extent Canada, use the 2285:Λεξικό της κοινής Νεοελληνικής (Dictionary of Modern Greek), Ινστιτούτο Νεοελληνικών Σπουδών, Θεσσαλονίκη, 1998. 1818: 1576: 134:
Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one
2721: 1985: 2264: 2762: 1783: 401: 266: km (10,000 square metres). When the metric system was further rationalised in 1960, resulting in the 2808: 2466: 808: 1686: 1526: 1837:. Vol. 27 (11th ed.). Cambridge University Press. pp. 426–467, see page 442 second para. 2747: 2093: 1476: 2447:
Official SI website: Table 6. Non-SI units accepted for use with the International System of Units
2010: 1897: 2124: 2119: 1918: 1720: 1486: 1015: 2114: 1505: 2367: 2198: 775:
is non-standard. The decimilliare is (100 mm) or roughly a four-inch-by-four-inch square.
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Encyclopaedia of scientific units, weights, and measures: their SI equivalences and origins
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BS350:Part 1:1974 Conversion factors and tables Part 1. Basis of tables. Conversion factors
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In 1960, when the metric system was updated as the International System of Units (SI), the
2538: 464: 286:(100 m) are not officially "accepted for use", they are still used in some contexts. 223: 1887: 2691: 2623: 2360: 2088: 970: 580: 480: 1823: 2802: 2752: 2676: 2613: 2603: 2145: 1828: 851: 772: 738: 495: 476: 494:
Some countries that underwent a general conversion from traditional measurements to
2696: 2653: 2638: 2593: 2573: 2490: 2199:"are – definition. American English definition of are by Macmillan Dictionary" 1329: 866: 241: 99: 1947: 2307: 2568: 2523: 1896:] (in Dutch). 's-Gravenhage and Amsterdam: de Gebroeders van Cleef. p.  1295: 1201: 1141: 1111: 974: 596: 196: 135: 2427: 1481: 1359: 1304: 1171: 706: 619:
The metric system of measurement was first given a legal basis in 1795 by the
2401: 2083: 2633: 2548: 2313: 676: 585: 484: 245: 1843:(about 10,000 square metres), to be paid whether the mine is worked or not. 2513: 2220: 1365: 978: 758: 646: 472: 2686: 2628: 2558: 2553: 2503: 1864: 1665: 1422: 1391: 1023: 1007: 987: 227: 1581: 850:), used for measuring land area. It was defined by older forms of the 611:
would mean 1 hectare, 21 ares, and 0.26 centiares (12,100.26 m).
2716: 2618: 2528: 2508: 2498: 1344: 1031: 1019: 1011: 993: 966: 591: 564: 539: 453:), although not a unit of SI, is the only named unit of area that is 271: 249: 1984:(in French). Université de Technologie de Compiègne. Archived from 211:
is about 0.405 hectares and one hectare contains about 2.47 acres.
2731: 2726: 2711: 2588: 2583: 2578: 2563: 2518: 1374: 1350: 1335: 1303: 1027: 1000: 957: 894: 705: 653: 632: 574: 526: 507: 400: 219: 213: 204: 129: 2309:
Mandated landscape: British imperial rule in Palestine, 1929–1948
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Metric and British imperial/United States customary comparisons
965:, and is equal to 10 ares or 1000 square metres. It is used in 660: 604: 520: 488: 468: 208: 200: 59: 2455: 2681: 2608: 2598: 947: 838: 433: 167: 1822: 442: 1782:. Law Society of South Africa. November 2007. Archived from 941: 824: 176: 2451: 935: 491:
instead of the hectare for measuring surface or land area.
424: 185: 158: 2366:. London, Berlin and Heidelberg: Springer Verlag. p.  1620:
The Council of the European Communities (27 May 2009).
807:"Are (unit)" redirects here. For the English verb, see 1462: 893:
hectare). It is used to describe the size of suburban
1780:"Instructions for the Conversions of Areas to Metric" 1511:. National Audit Office. 18 October 2006. p. 27. 938: 427: 161: 2263:. BNR Radio Bulgaria. 5 October 2010. Archived from 932: 698:) whose use was limited to the measurement of land. 445: 439: 430: 234:
In 1795, when the metric system was introduced, the
173: 164: 2740: 2662: 2537: 2489: 929: 421: 418: 155: 152: 112: 95: 73: 65: 55: 43: 38: 21: 2359: 2065:Robinson, Horatio Nelson; Fish, Daniel W. (1858). 1593: 1591: 1548:Bureau international des poids et mesures (2006), 1308:An acre shown inside a hectare for size comparison 2347:. British Standards Institution. 1974. p. 7. 846:) is a unit of area, equal to 100 square metres ( 673:International Committee for Weights and Measures 671:did not receive international recognition. The 457:. The name was coined in French, from the Latin 1752:"Working Paper No. 6 – Agroindustry in Myanmar" 1036: 2239:Grain and oil seeds, area and production, 2002 1456: 1327: 771:are or one square decimetre. Such usage of a 627:(7 April 1795) defined five units of measure: 2467: 1408: 1400: 998: 902: 874: 8: 2018:International Bureau of Weights and Measures 1380: 1372: 1342: 2758:Historical definitions of the SI base units 2402:"Chinese Measurements – Units of Area" 1389: 985: 458: 2474: 2460: 2452: 1467:), the Japanese translation of "hectare". 1357: 27: 18: 2261:"Market of agricultural land in Bulgaria" 1927:Secretariat of Public Education of Mexico 761:area evaluation of real estate plots) is 649:(1 m) for volume of stacked firewood 2072:. Ivison, Blakeman, Taylor. p. 363. 1716:"Appendix G – Weights and Measures" 1082:British imperial/United States customary 1051: 295: 1855:Oscar van Vlijmen (11 September 2006). 1497: 865:and some other languages of the former 741:to the original base unit of area, the 1551:The International System of Units (SI) 1759:MYA/01/008 Agriculture Sectore Review 1525:. Oxford Dictionaries. Archived from 7: 1312:The most commonly used units are in 799:(rarely used) is ten square metres. 50:Non-SI unit accepted for use with SI 1889:Allereerste Gronden der Cijferkunst 1861:Eenheden, constanten en conversies 1805:Britannica.com, unit of measurement 1319:One hectare is also equivalent to: 737:are derived by adding the standard 516: 230:is a little over a hectare in size. 2011:"SI brochure (Chapter 4; Table 8)" 1817:Caillard, Vincent Henry Penalver; 1642:Commonwealth of Australia (1970). 883:: 'a hundred', i.e. 100 m or 14: 656:(1 dm) for volumes of liquid 408:has an area of about one hectare. 77: 2781: 2780: 925: 854:, but is now outside the modern 834: 820: 414: 148: 2235:"Decrease in total grain yield" 1687:"Weights and Measures Act 1985" 1003:, dunum, dulum, donum, or dönüm 116:Imperial and US customary units 2768:System of units of measurement 1982:Tout sur les unités de mesure 1923:Nueva Escuela Mexicana Digital 569: 560: 552: 455:accepted for use with SI units 33:A visualisation of one hectare 1: 2156:Merriam-Webster, Incorporated 856:International System of Units 268:International System of Units 2358:François Cardarelli (2003). 222:. The playing field used in 2302:El-Eini, Roza I.M. (2006). 2221:"SI brochure (8th edition)" 1463: 1409: 1401: 1390: 1381: 1373: 1358: 1343: 1328: 986: 875: 688:European Economic Community 203:equal to a square with 100- 2830: 2151:Merriam Webster Dictionary 1863:(in Dutch). Archived from 1819:Gibb, Elias John Wilkinson 1807:, accessed 30 October 2009 806: 679:) makes no mention of the 218:St. Enda's GAA ground, in 2776: 2428:"CJK Compatibility block" 2201:. Macmillandictionary.com 1577:Oxford English Dictionary 1457: 903: 880: 346: 91: 26: 2722:minute and second of arc 1919:"Superficie de terrenos" 1894:Introduction to Numeracy 1886:Jacob de Gelder (1824). 757:(dma, sometimes seen in 639: 623:government. The law of 252:" + "are") was thus 100 2763:2019 revision of the SI 2304:"Currency and Measures" 1834:Encyclopædia Britannica 1664:Metric Pioneer (2020). 1644:"Metric Conversion Act" 1728:. 2006. Archived from 1600:"SI Brochure, Table 6" 1309: 1037: 999: 718: 642:(100 m) for area 535: 459: 409: 231: 139: 122:11,960 sq yd 2406:On-line Chinese Tools 2179:. Oxford Dictionaries 1307: 787:is one square metre. 709: 625:18 Germinal, Year III 404: 217: 133: 2664:Other accepted units 1455:is a combination of 694:(and implicitly the 621:French Revolutionary 248:, and the hectare (" 2814:Non-SI metric units 2748:Conversion of units 2241:. Statistics Norway 2223:. BIPM. March 2006. 2094:Dictionary.com, LLC 1969:Thierry Thomasset. 1477:Conversion of units 1323:1 square hectometre 1054: 549:traditional Chinese 483:, New Zealand and 376:107,639 sq ft 347:non-SI comparisons 301: 282:(1,000 m) and 240:was defined as 100 86:... is equal to ... 39:General information 16:Metric unit of area 2541:with special names 2389:metrication malta. 2267:on 22 October 2010 2125:Collins Publishers 2120:Collins Dictionary 1721:The World Factbook 1694:British Government 1487:Order of magnitude 1310: 1052: 969:and in the former 955:) is derived from 719: 557:simplified Chinese 410: 296: 232: 140: 120:    114:    106:    97:    2794: 2793: 2672:astronomical unit 2323:978-0-7146-5426-3 2316:. p. xxiii. 1529:on 1 January 2011 1440:CJK Compatibility 1302: 1301: 467:, including law ( 399: 398: 128: 127: 74:Conversions 2821: 2784: 2783: 2476: 2469: 2462: 2453: 2435: 2434: 2432: 2423: 2417: 2416: 2414: 2412: 2398: 2392: 2391: 2386: 2384: 2365: 2355: 2349: 2348: 2341: 2335: 2334: 2332: 2330: 2299: 2293: 2283: 2277: 2276: 2274: 2272: 2257: 2251: 2250: 2248: 2246: 2231: 2225: 2224: 2217: 2211: 2210: 2208: 2206: 2195: 2189: 2188: 2186: 2184: 2173: 2167: 2166: 2164: 2162: 2142: 2136: 2135: 2133: 2131: 2111: 2105: 2104: 2102: 2100: 2080: 2074: 2073: 2062: 2056: 2055: 2053: 2051: 2046:on 25 April 2009 2042:. Archived from 2036: 2030: 2029: 2027: 2025: 2015: 2007: 2001: 2000: 1998: 1996: 1990: 1979: 1966: 1960: 1959: 1957: 1955: 1944: 1938: 1937: 1935: 1933: 1915: 1909: 1908: 1906: 1904: 1883: 1877: 1876: 1874: 1872: 1859:[Area]. 1852: 1846: 1845: 1826: 1814: 1808: 1802: 1796: 1795: 1793: 1791: 1786:on 20 March 2018 1776: 1770: 1769: 1767: 1761:. Archived from 1756: 1748: 1742: 1741: 1739: 1737: 1712: 1706: 1705: 1703: 1701: 1691: 1683: 1677: 1676: 1674: 1672: 1666:"Metric Pioneer" 1661: 1655: 1654: 1652: 1650: 1639: 1633: 1632: 1630: 1628: 1617: 1611: 1610: 1608: 1606: 1595: 1586: 1573: 1567: 1565: 1564: 1562: 1556: 1545: 1539: 1538: 1536: 1534: 1519: 1513: 1512: 1510: 1502: 1466: 1460: 1459: 1454: 1453:SQUARE HEKUTAARU 1451: 1448: 1446: 1437: 1434: 1431: 1429: 1412: 1406: 1395: 1384: 1378: 1363: 1348: 1333: 1289: 1287: 1284: 1275: 1261: 1254:square kilometre 1242: 1240: 1231: 1197: 1192: 1167: 1162: 1137: 1132: 1107: 1102: 1071:succeeding unit 1055: 1042: 1005: 991: 954: 953: 950: 949: 944: 943: 940: 937: 934: 931: 906: 905: 899:allotment garden 892: 891: 887: 882: 878: 849: 845: 844: 841: 840: 831: 830: 827: 826: 770: 769: 765: 710:Definition of a 678: 571: 562: 554: 518: 471:), agriculture, 462: 452: 451: 448: 447: 444: 441: 436: 435: 432: 429: 426: 423: 420: 406:Trafalgar Square 302: 273: 265: 264: 260: 244:, or one square 183: 182: 179: 178: 175: 170: 169: 166: 163: 160: 157: 154: 121: 115: 107: 98: 31: 19: 2829: 2828: 2824: 2823: 2822: 2820: 2819: 2818: 2799: 2798: 2795: 2790: 2772: 2753:Metric prefixes 2736: 2658: 2540: 2533: 2485: 2480: 2443: 2438: 2430: 2425: 2424: 2420: 2410: 2408: 2400: 2399: 2395: 2382: 2380: 2378: 2357: 2356: 2352: 2343: 2342: 2338: 2328: 2326: 2324: 2301: 2300: 2296: 2284: 2280: 2270: 2268: 2259: 2258: 2254: 2244: 2242: 2233: 2232: 2228: 2219: 2218: 2214: 2204: 2202: 2197: 2196: 2192: 2182: 2180: 2175: 2174: 2170: 2160: 2158: 2144: 2143: 2139: 2129: 2127: 2113: 2112: 2108: 2098: 2096: 2082: 2081: 2077: 2064: 2063: 2059: 2049: 2047: 2038: 2037: 2033: 2023: 2021: 2013: 2009: 2008: 2004: 1994: 1992: 1991:on 21 July 2011 1988: 1977: 1968: 1967: 1963: 1953: 1951: 1946: 1945: 1941: 1931: 1929: 1917: 1916: 1912: 1902: 1900: 1885: 1884: 1880: 1870: 1868: 1867:on 19 June 2021 1854: 1853: 1849: 1816: 1815: 1811: 1803: 1799: 1789: 1787: 1778: 1777: 1773: 1768:on 15 May 2013. 1765: 1754: 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1306: 1298: 1297: 1292: 1290: 1278: 1276: 1271: 1269: 1267: 1264: 1262: 1257: 1255: 1252: 1251: 1248: 1247:2.47105 acres 1245: 1243: 1234: 1232: 1227: 1225: 1222: 1220: 1217: 1215: 1212: 1210: 1207: 1206: 1203: 1199: 1194: 1191:31.623 m 1189: 1186: 1183: 1180: 1177: 1176: 1173: 1169: 1164: 1159: 1156: 1153: 1150: 1147: 1146: 1143: 1139: 1134: 1131:3.1623 m 1129: 1126: 1123: 1120: 1117: 1116: 1113: 1109: 1104: 1099: 1096: 1094: 1091: 1088: 1087: 1081: 1078: 1073: 1068: 1063: 1060: 1057: 1056: 1047: 1041: 1040: 1035: 1033: 1029: 1025: 1021: 1017: 1013: 1009: 1004: 1002: 997: 995: 990: 989: 984: 983: 982: 980: 976: 973:areas of the 972: 968: 964: 960: 959: 952: 922: 918: 910: 908: 900: 896: 877: 872: 868: 864: 859: 857: 853: 852:metric system 843: 829: 817: 810: 802: 800: 798: 790: 788: 786: 778: 776: 774: 773:double prefix 760: 756: 748: 746: 744: 740: 736: 732: 728: 724: 717: 713: 708: 701: 699: 697: 693: 689: 686:In 1972, the 684: 682: 674: 670: 662: 658: 655: 651: 648: 644: 641: 637: 634: 630: 629: 628: 626: 622: 614: 612: 610: 609:1-21-00.26 ha 606: 598: 594: 593: 589: 587: 583: 582: 578: 576: 572: 566: 558: 550: 546: 543: 541: 537: 533: 529: 528: 524: 522: 514: 510: 509: 505: 504: 503: 500: 497: 492: 490: 486: 482: 478: 477:town planning 474: 470: 466: 461: 456: 450: 412:The hectare ( 407: 403: 394: 391: 390: 386: 383: 382: 378: 375: 374: 370: 367: 366: 362: 360:0.3861 sq mi 359: 358: 354: 351: 350: 345: 339: 336: 335: 331: 328: 327: 323: 320: 319: 315: 312: 311: 307: 304: 303: 300: 294: 289: 287: 285: 281: 277: 269: 255: 251: 247: 243: 242:square metres 239: 238: 229: 225: 221: 216: 212: 210: 206: 202: 198: 195: 191: 187: 181: 145: 137: 132: 118: 111: 104: 101: 100:SI base units 94: 90: 87: 84: 82: 78: 72: 68: 64: 61: 58: 54: 51: 48: 46: 42: 37: 30: 25: 20: 2796: 2701: 2697:electronvolt 2421: 2409:. 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Retrieved 1527:the original 1517: 1500: 1420: 1318: 1313: 1311: 1293: 1279: 1272: 1265: 1258: 1253: 1246: 1235: 1228: 1224:0.01 km 1223: 1218: 1213: 1208: 1084:equivalents 1076:square side 1069:Fraction of 1064:Multiple of 962: 956: 920: 916: 914: 870: 867:Soviet Union 860: 815: 813: 796: 794: 784: 782: 755:decimilliare 754: 752: 749:Decimilliare 742: 734: 730: 726: 722: 720: 715: 711: 695: 691: 685: 680: 668: 666: 618: 608: 602: 599:(until 1937) 590: 579: 568: 544: 525: 506: 501: 493: 411: 293: 283: 279: 275: 253: 236: 235: 233: 189: 143: 141: 124:2.4711 acres 85: 80: 56:Unit of 2411:24 December 2271:16 November 2245:16 November 2183:24 December 1700:17 December 1605:17 November 1561:13 February 1533:24 December 1274:1000 m 1196:1000 m 1048:Conversions 975:Middle East 904:шесть соток 848:10 m × 10 m 702:Unit family 597:Netherlands 368:2.471 acre 340:1,000,000 m 290:Description 197:metric unit 136:square mile 45:Unit system 2803:Categories 2491:Base units 2161:16 October 2130:16 October 2115:"centiare" 2099:16 October 2084:"centiare" 2050:7 February 1871:15 January 1790:21 January 1627:29 January 1566:Chapter 5. 1493:References 1482:Hectometre 1425:character 1296:sq mi 1230:100 m 1166:100 m 1142:sq yd 1112:sq ft 1074:Length of 1058:Unit name 1043:in Norway. 879:(Russian: 873:is called 721:The names 714:and of an 635:for length 469:land deeds 465:management 395:0.4047 ha 363:1 km 342:1 km 299:area units 79:1 ha 2634:steradian 2549:becquerel 2314:Routledge 2146:"deciare" 2069:Academies 2024:28 August 1671:14 August 1649:14 August 1557:, 8th ed. 1523:"hectare" 1438:, in the 1436:SQUARE HA 1392:stremmata 1200:0.988422 1161:10 m 1136:10 m 1089:centiare 1016:Palestine 586:Argentina 485:Australia 387:259.0 ha 332:10,000 m 246:decametre 2786:Category 2741:See also 2514:kilogram 2483:SI units 2383:29 March 1995:21 March 1973:Le stère 1821:(1911). 1736:8 August 1471:See also 1464:hekutāru 1450:㌶ 1433:㏊ 1407:or 0.15 1396:(Greece) 1366:Thailand 1170:3.95369 1157:0.1 daa 1118:deciare 1106:1 m 1101:1 m 979:Bulgaria 785:centiare 779:Centiare 759:cadastre 723:centiare 663:for mass 570:gōngqǐng 545:Gongqing 473:forestry 384:1 sq mi 188:symbol: 2702:hectare 2687:decibel 2629:sievert 2624:siemens 2554:coulomb 2504:candela 1954:2 March 1831:(ed.). 1423:Unicode 1417:Unicode 1288: m 1241: m 1209:hectare 1187:0.1 ha 1178:decare 1172:perches 1097:0.1 da 1061:Symbol 1024:Lebanon 1008:Balkans 1006:in the 988:Stremma 971:Ottoman 888:⁄ 863:Russian 797:deciare 791:Deciare 766:⁄ 735:hectare 727:deciare 712:hectare 696:hectare 615:History 595:in the 581:Manzana 532:Turkish 513:Persian 392:1 acre 355:metric 337:100 ha 274:), the 261:⁄ 228:hurling 192:) is a 144:hectare 22:hectare 2717:minute 2677:dalton 2619:radian 2614:pascal 2604:newton 2529:second 2509:kelvin 2499:ampere 2374:  2320:  2289:  2205:20 May 2020:. 2006 1696:. 1985 1447: 1445:U+3336 1430: 1428:U+33CA 1345:feddan 1341:2.381 1326:1.008 1266:100 ha 1219:10 daa 1154:10 da 1127:0.1 a 1124:10 ca 1032:Turkey 1030:, and 1020:Jordan 1012:Israel 994:Greece 967:Norway 921:dekare 917:decare 911:Decare 869:, the 768:10,000 731:decare 592:Bunder 567:: 565:pinyin 559:: 551:: 540:Turkey 527:Djerib 496:metric 475:, and 352:non-SI 324:100 m 250:hecto- 194:non-SI 81:in ... 66:Symbol 2732:tonne 2727:neper 2712:litre 2654:weber 2639:tesla 2594:lumen 2589:katal 2584:joule 2579:hertz 2574:henry 2564:farad 2519:metre 2431:(PDF) 2329:5 May 2177:"are" 2014:(PDF) 1989:(PDF) 1978:(PDF) 1932:6 May 1892:[ 1841:jerib 1827:. 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Index


Unit system
Non-SI unit accepted for use with SI
Area
SI base units

square mile
/ˈhɛktɛər,-tɑːr/
SI
non-SI
metric unit
area
metre
acre

Omagh
Gaelic football
hurling
square metres
decametre
hecto-
International System of Units
area units

Trafalgar Square
/ˈhɛktɛər,-tɑːr/
accepted for use with SI units
management
land deeds
forestry

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