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Webster 1913 Edition

Adj.

Of or pertaining to synergism.

“A synergistic view of regeneration.”

Shedd.

Cooperating; synergetic.

synergistic ‎(comparative more synergistic, superlative most synergistic)

Of or pertaining to synergy or synergism; co-operative, working together, interacting, mutually stimulating.

synergistic