Source : Webster's Revised Unabridged Dictionary (1913)

Dolce \Dol"ce\, Dolcemente \Dol`ce*men"te\, adv. [It., fr. L.
   dulcis sweet, soft.] (Mus.)
   Softly; sweetly; with soft, smooth, and delicate execution.

Source : WordNet®

dolce
     adv : gently and sweetly