- reciprocal action and reaction
- Interplay is a ballet made by Jerome Robbins, subsequently balletmaster of New York City Ballet, for Billy Rose's Concert Varieties to Morton Gould's 1945 American Concertette. ...
- Interplay is a 1962 (see 1962 in music) album by jazz musician Bill Evans. It was recorded on July 16-17, 1962 in NYC, whilst the Interplay Sessions were recorded on August 21 of the same year.
- interaction; to interact
- (n) : the working of one part with an other