Arpent

Arpent, a French measure of length and area. Numerous regional variants of the arpent coexisted in 17th-century France; of these, the arpent de Paris came into use in Canada before 1636 as part of a system of measures. The arpent de superficie, or square arpent (equivalent to 0.342 ha), remained the standard measure of land area in the old seigneurial districts of Québec until supplanted by the metric system in the late 1970s.

See Early French Measurement: Table.