Source : Webster's Revised Unabridged Dictionary (1913)

Lento \Len"to\ (l[asl]n"t[-o]; E. l[e^]n"t[-o]), a. & adv. [It.]
   (Mus.)
   Slow; in slow time; slowly; -- rarely written {lente}.

Source : WordNet®

lento
     adj : (of tempo) slow
     adv : in music; "Play this lento, please" [syn: {slowly}]