Main Entry: opus

Pronunciation: \ˈō-pəs\

Function: noun

Inflected Form(s): plural op·era \ˈō-pə-rə, ˈä-\ also opus·es \ˈō-pə-səz\

Etymology: Latin oper-, opus — more at operate

Date: 1809

: work; especially : a musical composition or set of compositions usually numbered in the order of its issue