tolerance

noun

• 1 [mass noun] the ability or willingness to tolerate the existence of opinions or behaviour that one dislikes or disagrees with:the tolerance of corruption an advocate of religious tolerance

• 2the capacity to endure continued subjection to something such as a drug or environmental conditions without adverse reaction:the desert camel shows the greatest tolerance to dehydration [count noun]:various species of diatoms display different tolerances to acid
• diminution in the body’s response to a drug after continued use: the body’s tolerance to Ecstasy builds up very quickly

• 3an allowable amount of variation of a specified quantity, especially in the dimensions of a machine or part:250 parts in his cars were made to tolerances of one thousandth of an inch