I. ə-ˈle-(ˌ)grō, -ˈlā- noun
( plural -gros )
Date: 1683
: a musical composition or movement in allegro tempo
II. adverb or adjective
Etymology: Italian, merry, from Vulgar Latin * alecrus lively, alteration of Latin alacr-, alacer
Date: circa 1721
: at a brisk lively tempo — used as a direction in music