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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 of apple. 1  1 : the fleshy, usually rounded red, yellow, or green edible pome fruit of a usually cultivated tree (genus Malus) of the rose family; also : an apple tree â compare crab apple. 2  2 : a fruit (such as a star apple) or other vegetative growth (such as an oak apple) suggestive of an apple.