1. An entertainment spectacle of swimmers and divers, often performing in unison to the accompaniment of music.
2. An elaborate aquatic performance or exhibition consisting of swimming, diving, etc., usually accompanied by music.
3. Etymology: from Latin aqua- + -cade, from Latin cavalcade.

Literally, "a procession on horseback", in the twentieth century, -cade came to be regarded as a suffix and taken to form such words as, motorcade, aquacade, etc.