allegretto (Adjective) — (of tempo) faster than allegro.
allegretto (Noun) — A quicker tempo than andante but not as fast as allegro.
allegretto (Noun) — A musical composition or musical passage to be performed at a somewhat quicker tempo than andante but not as fast as allegro.
allegretto (Adverb) — (music) in a moderately quick tempo. ex. "play this more allegretto"