WordReference Random House Learner's Dictionary of American English © 2015
tol•er•ance /ˈtɑlərəns/USA pronunciation n. 
  1. [uncountable] a fair, open attitude toward people whose race, religion, practices, etc., differ from one's own:a long history of tolerance toward the beliefs of others.
  2. the act of enduring or capacity to endure; endurance: [uncountable]My tolerance for noise is limited.[countable]a weak tolerance for the drug.

Collins Concise English Dictionary © HarperCollins Publishers::

tolerance /ˈtɒlərəns/ n
  1. the state or quality of being tolerant
  2. capacity to endure something, esp pain or hardship
  3. the permitted variation in some measurement or other characteristic of an object or workpiece
  4. the capacity of an organism to endure the effects of a poison or other substance, esp after it has been taken over a prolonged period

'tolerance' also found in these entries:

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