Definition of hectare noun from the Oxford Advanced Learner's Dictionary

 

hectare

 noun
noun
BrE BrE//ˈhekteə(r)//
 
, also BrE//ˈhektɑː(r)//
 
; NAmE NAmE//ˈhekter//
 
(abbreviation ha)
 
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a unit for measuring an area of land; 10 000 square metres or about 2.5 acres Word Origin early 19th cent.: from French, formed irregularly from Greek hekaton ‘hundred’ + are2.
See the Oxford Advanced American Dictionary entry: hectare