| Noun | 1. | allegro - a brisk and lively tempo allegro con spirito - lively with spirit |
| 2. | allegro - a musical composition or musical passage to be performed quickly in a brisk lively mannermusical composition, opus, piece of music, composition, piece - a musical work that has been created; "the composition is written in four movements" musical passage, passage - a short section of a musical composition | |
| Adj. | 1. | allegro - (of tempo) fast fast - at a rapid tempo; "the band played a fast fox trot" |
| Adv. | 1. | allegro - in a quick and lively tempo; "play this section allegro"music - an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner |