Hectare
WordNet
noun
(1) (abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters)
WiktionaryText
Etymology
From , formed from + .
Noun
- 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.