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  1. Taken from the Italian musical term meaning fast and lively. Fast; jumps performed to a quick, sharp tempo; grandee allegro - large jumps; petite allegro - small jumps.
  2. [Italian: "happy"]. The third part of a ballet class: fast work, jumps, turns. Usually divided into petit ["little"] allegro and grand ["big"] allegro. Source: Vance's Fantastic - BALLET DICTIONARY