- brisk or rapid in tempo.
noun, plural al·le·gros.
- an allegro movement.
- (to be performed) quickly, in a brisk lively manner
noun plural -gros
- a piece or passage to be performed in this manner
1680s as a musical term, from Italian allegro “cheerful, gay,” from Latin alacrem (nominative alacer) “lively, cheerful, brisk” (see alacrity).
A brisk, lively musical tempo. Allegro is Italian for “cheerful.”