Pronunciation: (tol'ur-unt),[key] —adj. 1. inclined or disposed to tolerate; showing tolerance; forbearing: tolerant of errors. 2. favoring toleration: a tolerant church. 3. Med.,Immunol. a. able to endure or resist the action of a drug, poison, etc.
b. lacking or exhibiting low levels of immune response to a normally immunogenic substance.