I. əˈle(ˌ)grō, -lā-, äˈ- adverb (or adjective)
Etymology: Italian, merry, gay, from (assumed) Vulgar Latin alecrus lively, alteration of Latin alacr-, alacer — more at alacrity
: in a brisk lively manner — used as a direction in music
II. noun
( -s )
1. : a piece or movement or division of a movement in allegro tempo
2.
a. : ballet steps (as leaps, jumps, and turns) performed in a lively fast tempo
b. : rapid exercises and steps terminating a ballet class