hectare (hĕk`târ, –tär), abbr. ha, unit of area in the metric systemmetric system,
system of weights and measures planned in France and adopted there in 1799; it has since been adopted by most of the technologically developed countries of the world.
..... Click the link for more information. , equal to 10,000 sq m, or about 2.47 acres.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a metric unit of area used for measuring plots of land. Its abbreviated form in Russian is ga; internationally, ha. The area of 1 ha is equal to the area of a square with a side of 100 m. The designation “hectare” comes from are, a unit of area, to which the prefix hecto- is added. As defined, 1 ha = 100 are = 10,000 sq m; 1 desiatina = 1.09254 ha.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
A unit of area in the metric system equal to 100 ares or 10,000 square meters. Abbreviated ha.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A metric unit of area equal to 10,000 square meters; approximately 2 ½acres.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
one hundred ares. 1 hectare is equivalent to 10 000 square metres or 2.471 acres.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005