Meaning & Definition of word "Allergy"

noun:

• 1. A hypersensitivity disorder acquired by exposure to a specific antigen, leading to exaggerated immune responses.
  • Example: She discovered her allergy to peanuts after experiencing a severe reaction.
• 2. A condition marked by an abnormal reaction to a substance, such as pollen, dust, or certain foods.
  • Example: His grass pollen allergy causes him to sneeze and have itchy eyes in the spring.
• 3. A medical condition resulting from exposure to a typically harmless substance that causes an immune response.
  • Example: Her doctor suggested she get tested for allergies after she complained of frequent hives.
• 4. A negative or adverse reaction to a particular substance or situation.
  • Example: He has a strong allergy to being in crowded places.