arpent

An arpent is the name give to a unit of length and to a unit of area. It is not an SI unit. It is used in Quebec as well as in some areas of the United States that were part of French Louisiana.
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Noun
1. a former French unit of area; equal approximately to an acre
(hypernym) area unit, square measure

n. arpent, a former French unit of area equal approximately to an acre

(n.)
Alt. of Arpen
  

A unit of measure mentioned in the Star’s charter--‘knights of the star shall never flee more than 40 arpents from a battle....’