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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.
Allergy-Immunology Glossary. Here are definitions of some of the words frequently encountered in literature on allergy and asthma. Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms.