decime /dɛˈsiːm/ noun3 •(informal) A 10-centime coin, minted up to 1999 and bearing the same value. •(historical) A French coin minted from 1795 to 1801 and from 1814 to 1815, valued at one-tenth of a franc. •(no longer used, historical) Synonym of tithing (a division of the hundreds of medieval England) formsdecimes · décimes