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Noun. 1. synergy-the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects. synergism.
Learner's definition of ALLERGY. : a medical condition that causes someone to become sick after eating, touching, or breathing something that is harmless to most people. â often + to. â sometimes used figuratively in informal contexts. [noncount]. Many people have some form of allergy.