n. A unit of surface area (symbol ha) equal to 100 ares (that is, 10,000 square metres, one hundredth of a square kilometre, or approximately 2.5 acres), used for measuring the areas of geographical features such as land and bodies of water.
the GNU version of the Collaborative International Dictionary of English
n. A measure of area, or superficies, containing a hundred ares, or 10,000 square meters, and equivalent to 2.471 acres.
The Century Dictionary and Cyclopedia
n. In the metric system, a superficial measure equal to 100 ares, or 10,000 square meters, or 2.4711 acres.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. (abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters)
Word Usage
"By the way I understand, probably incorrectly, that the use of hectarea instead of hectare is a Mexican idiosyncracy."