[fan.ta.sy] n, pl -sies [ME fantasie--more at fancy] (14c) 1 obs: hallucination
2: fancy; esp: the free play of creative imagination
3: a creation of the imaginative faculty whether expressed or merely conceived: as a: a fanciful design or invention b: a chimerical or fantastic notion c: fantasia 1 d: imaginative fiction featuring esp. strange settings and grotesque characters--called also fantasy fiction
4: caprice
5: the power or process of creating esp. unrealistic or improbable mental images in response to psychological need "an object of ~"; also: a mental image or a series of mental images (as a daydream) so created "sexual fantasies of adolescence"
6: a coin usu. not intended for circulation as currency and often issued by a dubious authority (as a government-in-exile)
[2]fantasy vb -sied ; -sy.ing (15c): fantasize