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Search also in: Web News Encyclopedia Images. opus (opuses plural) (opera plural) 1 n-count An opus is a piece of classical music by a particular composer. Opus is usually followed by a number which indicates at what point the piece was written. The abbreviation op. is also used.
Definition. adjective. (1) Of, pertaining to, having, or requiring the presence of air or free oxygen. (2) (biology) Requiring air or oxygen for life or survival, used especially to refer to aerobic bacteria. (3) (physiology) Pertaining to respiration occurring in the presence of oxygen, as aerobic respiration.