NOUN (2)

1. a quicker tempo than andante but not as fast as allegro;

2. a musical composition or musical passage to be performed at a somewhat quicker tempo than andante but not as fast as allegro;


ADJECTIVE (1)

1. (of tempo) faster than allegro;


ADVERB (1)

1. in a moderately quick tempo;
- Example: "play this more allegretto"

The Collaborative International Dictionary of English v.0.48:

Allegretto \Al`le*gret"to\, a. [It., dim. of allegro.] (Mus.)
   Quicker than andante, but not so quick as allegro. -- n. A
   movement in this time.
   [1913 Webster]

WordNet (r) 3.0 (2006):

allegretto
    adv 1: in a moderately quick tempo; "play this more allegretto"
    adj 1: (of tempo) faster than allegro
    n 1: a quicker tempo than andante but not as fast as allegro
    2: a musical composition or musical passage to be performed at a
       somewhat quicker tempo than andante but not as fast as
       allegro