NOUN (1)

1. (music) a composition or passage that is to be performed in a slow and dignified manner;


ADJECTIVE (1)

1. very slow in tempo and broad in manner;


ADVERB (1)

1. slowly and broadly;

The Collaborative International Dictionary of English v.0.48:

Largo \Lar"go\, a. & adv. [It., large, L. largus, See Large.]
   (Mus.)
   Slow or slowly; -- more so than adagio; next in slowness to
   grave, which is also weighty and solemn. -- n. A movement
   or piece in largo time.
   [1913 Webster]

WordNet (r) 3.0 (2006):

largo
    adv 1: slowly and broadly
    adj 1: very slow in tempo and broad in manner
    n 1: (music) a composition or passage that is to be performed in
         a slow and dignified manner