n.
Pronunciation: ' ō -p ə s
Function: noun
Inflected Form: plural op · era \ ' ō -p ə -r ə , ' ä- \ also opus · es \ ' ō -p ə -s ə z \
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