o ‧ pus /ˈəʊpəs $ ˈoʊ-/ BrE AmE noun ( plural opuses or opera /ˈɒpərə $ ˈɑː-/) [usually singular]
[ Date: 1700-1800 ; Language: Latin ; Origin: 'work' ]
1 . a piece of music by a great musician, numbered according to when it was written:
Beethoven’s Opus 95
2 . formal an important work of art by a famous writer, painter etc
⇨ ↑ magnum opus