1. inclined or disposed to tolerate; showing tolerance; forbearing: tolerant of errors.
  2. favoring toleration: a tolerant church.
  3. Medicine/Medical, Immunology.
    1. able to endure or resist the action of a drug, poison, etc.
    2. lacking or exhibiting low levels of immune response to a normally immunogenic substance.


  1. able to tolerate the beliefs, actions, opinions, etc, of others
  2. permissive
  3. able to withstand extremes, as of heat and cold
  4. med (of a patient) exhibiting tolerance to a drug

1784, from Latin tolerantia “endurance,” from tolerans, present participle of tolerare “to bear, endure, tolerate” (see toleration). Related: Tolerantly.

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