quinzaine
noun
quin·zaine
(ˈ)kaⁿ¦zān,
(ˈ)kan¦-
plural -s
: a period of 15 days
specifically : an ecclesiastical period comprising a feast day and the fortnight after or (as at Easter) the week before and the week after
Word History
Etymology
French, from Middle French, from quinze fifteen, from Latin quindecim