Webster’s Revised Unabridged Dictionary · 1913
Hectare
Hec′tare′ (hĕk′târ′; F. ̇k′tȧr′), n. [F., fr. Gr. ἑκατόν hundred + F. are an are.] A measure of area, or superficies, containing a hundred ares, or 10,000 square meters, and equivalent to 2.471 acres.