al·le·gro 
(ə-lĕgrō, ə-lāgrō) Music
(ə-lĕgrō, ə-lāgrō) Music adv. & adj. Abbr. allo
In a quick, lively tempo, usually considered to be faster than allegretto but slower than presto. Used chiefly as a direction.
n. pl. al·le·gros
1. An allegro passage or movement.
2. A succession of fast jumps performed as an exercise in ballet.
[Italian, from Latin alacer, lively.]