'Fantasia' definitions:

Definition of 'fantasia'

From: WordNet
noun
A musical composition of a free form usually incorporating several familiar themes

Definition of 'Fantasia'

From: GCIDE
  • Fantasia \Fan*ta"si*a\, n. [It. See Fancy.] (Mus.) A continuous composition, not divided into what are called movements, or governed by the ordinary rules of musical design, but in which the author's fancy roves unrestricted by set form. [1913 Webster]