APMa piece of music that does not have a regular form or style 幻想曲；狂想曲
Examples from the Corpus
fantasia• The hotel lobby was a fantasia of streamers and lanterns.• But the musical is a vehicle to liberate all the pent-up frustrations of Billy's fantasia.• At the same time, I knew they were stupid fantasias but believed that I was helpless in the face of them.
Fan·ta·si·an /fænˈteɪziə $ -ʒə/ trademark
n(1940) a US film made by Walt disney, which consists of a number of different short cartoons, each one with its own piece of classical music. The conductor of the music is Leopold stokowski, and the cartoons include one in which a group of hippopotamuses dance.