synergism.

from The Collaborative International Dictionary of English v.0.48
Synergism \Syn"er*gism\, 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]
   [1913 Webster]
    
from The Collaborative International Dictionary of English v.0.48
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]
    

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