Arpent
'ARPENT, noun
In Domesday, it is written arpennus, arpendus, and arpent Columella mentions that the arepennis was equal to half the Roman juger. The word is supposed to be corrupted from arvipendium, or aripennium, the measuring of land with a cord.
A portion of land in France, ordinarily containing one hundred square rods or perches, each of 18 feet. But the arpent is different in different parts of France. The arpent of Paris contains 900 square toises. It is less than the English acre, by about one seventh.