The Collaborative International Dictionary of English v.0.48:
Dolce \Dol"ce\, Dolcemente \Dol`ce*men"te\, adv. [It., fr. L. dulcis sweet, soft.] (Mus.) Softly; sweetly; with soft, smooth, and delicate execution. DolcinoWordNet (r) 3.0 (2006):
dolce adv 1: gently and sweetly