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. Compare anaphylaxis .

Informal . a strong dislike or aversion, as toward a person or activity

He has an allergy to hard work.

noun

allergic reaction , aversion , hay fever , hypersensitivity , sensitivity , susceptibility , vulnerability