noun.
Any of various French units of land measurement, especially one used in parts of Canada and the southern United States and equal to about 0.4 hectare (0.85 acre).
The Century Dictionary and Cyclopedia
noun.
An old French measure for land.
the GNU version of the Collaborative International Dictionary of English
noun.
Formerly, a measure of land in France, varying in different parts of the country. The arpent of Paris was 4,088 sq. yards, or nearly five sixths of an English acre. The woodland arpent was about 1 acre, 1 rood, 1 perch, English.