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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.
Top Definition. pi. The transcendental number which refers to the definition (in which it is multiplied by the radius of a circle) of the area of the circle. (or if multiplied by the diameter, defines the circumfrence). This is the first 50k digits of pi...to top that other guy's number. Beat.