is a Latin word for ''work''. The plural of ''opus'' is '' Opera ''. It is used in many fields, notably in architecture and in music.
- In music, pieces of music by composers are given Opus Number s, which generally run in order of publication. Unpublished compositions often are given WoO numbers (''Werk ohne Opuszahl'', German for ''work without opus number'').
- In architecture, it specifically describes a technique or a method or a style of connecting building elements, following the studies on Roman architecture. Roman building styles are commonly classified as:
- --- Opus Incertum
- --- Opus Testaceum (also called '' Opus Latericium '')
- --- Opus Caementicium
- --- Opus Reticulatum (also called '' Opus Certum '')
- --- Opus Siliceum
- --- Opus Quadratum
- --- Opus Vittatum
- --- Opus Mixtum
- --- Opus Spicatum
- --- Opus Alexandrinum
- In fine art, Opus is the formal name or nickname of a work of art
- --- Magnum Opus (or Opus magnum) refers to the best, most popular, or most renowned achievement of an author, artist, or composer. ''Magnum'' is Latin for ''great''
- Opus (band) is an Austrian pop-rock group
- Opus (comic Strip) is a comic strip by Berkeley Breathed starring Opus The Penguin
- '' Opus '' is the name of an Australian magazine produced by Newcastle University Students' Association
- Opus (microkernel) was a microkernel developed at Apple and later Taligent as the base for the Pink operating system
- Opus Bus is a model made by the Optima Bus Corporation
- Opus Dei (God's work) is a Roman Catholic organization founded in 1928, which emphasizes the Catholic belief that everyone is called to be a saint and that ordinary life is a path to sanctity
- Opus, Greece is an ancient Greek city of Eastern Locris, on the coast of mainland Greece across from Euboea
- Opus International Group PLC is the corporate holding company for several companies operating under the "Opus" brand name in several countries
- Opus Pistorum is a novel by Henry Miller
- Opus-CBCS is a Bulletin Board (Computer Based Conversation System)
- Opus String Quartet (real name is ''opus.'' with a period)
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