- an abnormal reaction of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often manifested by itchy eyes, runny nose, wheezing, skin rash, or diarrhea.
- hypersensitivity to the reintroduction of an allergen.
- a strong dislike or aversion, as toward a person or activity: He has an allergy to hard work.
- a hypersensitivity to a substance that causes the body to react to any contact with that substance. Hay fever is an allergic reaction to pollen
- aversion
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