Hypertext Webster Gateway: "Fantasia"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
fantasia
n : a musical composition of a free form usually incorporating
several familiar themes
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