The Collaborative International Dictionary of English v.0.48:
cha-cha-cha \cha-cha-cha\ n. same as cha-cha. Syn: cha-cha. [WordNet 1.5]WordNet (r) 3.0 (2006):
cha-cha-cha n 1: a modern ballroom dance from Latin America; small steps and swaying movements of the hips [syn: cha-cha, cha-cha- cha]