'Synergy' definitions:

Definition of 'synergy'

From: WordNet
noun
The working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects [syn: synergy, synergism]

Definition of 'Synergy'

From: GCIDE
  • Synergy \Syn"er*gy\, n. [Gr. ?. See Synergetic.]
  • 2. Combined action; especially (Med.), the combined healthy action of every organ of a particular system; as, the digestive synergy. [1913 Webster]
  • 2. An effect of the interaction of the actions of two agents such that the result of the combined action is greater than expected as a simple additive combination of the two agents acting separately; -- also called synergism.. Opposite to antagonism. [PJC]