Tolerance refers to the ability to endure pain or hardship; endurance. It commonly describes the ability or practice of tolerating; an acceptance of or patience with the beliefs, opinions or practices of others; a lack of bigotry, the ability of the body (or other organism) to resist the action of a poison, to cope with a dangerous drug or to survive infection by an organism, and the variation or deviation from a standard, especially the maximum permitted variation in an engineering measurement, which gives the term a broader and more practical sense than a single short definition would suggest. Depending on context, it can also point to the ability of the body to accept a tissue graft without rejection, so the category can cover literal uses, related ideas, and more figurative extensions of the same core meaning. Taken together, these meanings present Tolerance as a flexible theme rather than a narrowly technical label, covering the central idea people usually mean when they use the word while still leaving room for closely related senses that appear in real language. Tolerance therefore works well as a quotation category because it can hold direct statements about the subject, figurative uses that borrow its meaning, and broader reflections that stay anchored to the same central idea.
