Meaning

noun an instrumental composition that doesn't adhere to rules for any specific musical form and is played with improvisation

originEtymology tree Proto-Indo-European *kap- Proto-Indo-European *káput Proto-Italic *kaput Latin caput Vulgar Latin capus Old Italian capo Proto-Indo-European *ǵʰḗrder. Latin ērīcius Old Italian riccio Old Italian caporiccio Italian capricciobor. English capriccio Borrowed from Italian capriccio. Doublet of caprice.

Etymology from Wiktionary, CC BY-SA 3.0