The Collaborative International Dictionary of English v.0.48:
Synergetic \Syn`er*get"ic\, a. [Gr. ?, fr. ? to work together; sy`n with + 'e`rgon work.] Working together; cooperating; as, synergetic muscles. [1913 Webster]WordNet (r) 3.0 (2006):
synergetic adj 1: working together; used especially of groups, as subsidiaries of a corporation, cooperating for an enhanced effect; "a synergistic effect" [syn: synergetic, synergistic]