Webster's English Dictionary

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allegro

1. al.le.gro \*-'leg-(.)ro-, -'la--(.)gro-\ av(or aj) [It, merry, fr. 
   (assumed) VL alecrus lively, alter. of L alacr-, Xalacer - more at ALACRITY 
   : in a brisk lively manner - used as a direction in music 
2. allegro n : a piece or movement in allegro tempo