☙

once [French]

1

In France, various units of mass, the principal subdivision of the livre :

late 8ᵗʰ century – mid 14ᵗʰ century, the once esterlin = ¹⁄₁₂ of the livre esterlin, about 30.6 grams.
12ᵗʰ century – late 18ᵗʰ century, the once poids de marc = ¹⁄₁₆ of the livre poids de marc, at the standard of Paris about 30.6 grams.
1800 – 1812, the once mètrique, = 100 grams.
1812 – 1840, the once usuelle, = 31.250 grams.

In Nice, France, a unit of length, = ¹⁄₁₂ palme or pan, about 21.833 millimeters.

Doursther, page 369.

In Cahors, France, a unit of land area, a seed measure of land area based on ¹⁄₁₆ boisseau, about 19.95 square meters.

Doursther, page 369.