Main Entry: de·cade

Pronunciation: \ˈde-ˌkād, de-ˈkād; especially sense 1b ˈde-kəd\

Function: noun

Etymology: Middle English, from Middle French décade, from Late Latin decad-, decas, from Greek dekad-, dekas, from deka

Date: 15th century

1 : a group or set of 10: as a : a period of 10 years b : a division of the rosary that consists primarily of 10 Hail Marys
2 : a ratio of 10 to 1 : order of magnitude

— de·cad·al \ˈde-kə-d^əl\ adjective