(n)the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects, Syn.synergism
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
n. [ See Synergetic. ] (Theol.) The doctrine or theory, attributed to Melanchthon, that in the regeneration of a human soul there is a cooperation, or joint agency, on the part both of God and of man. [ 1913 Webster ]