quinzaine

Etymology
Borrowed from.

Noun

 * 1) The fifteenth day after a feast day, including both days in the reckoning.
 * 2)  A piece of verse having fifteen syllables.

Etymology
From.

Noun

 * 1) about fifteen people, about fifteen things, etc.
 * 2) a period of fifteen consecutive days
 * 3)  two weeks; a fortnight
 * 1) a period of fifteen consecutive days
 * 2)  two weeks; a fortnight