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tolerance. Tolerance is the quality of requiring a larger dose of a certain drug every time to reach the same effects. For example, if you need 2-5 hits to get stoned at first, if you smoke regularly and at close intervals (every day or every other day) you will start requiring more hits to get the same high.
Answer Wiki. Tolerance is the limit of random (unintentional) deviation of a dimension from its nominal value. Allowance is the amount of designed (intentional) deviation between two mating dimensions in a fit, which, in combination with their respective tolerances, results into a maximum and minimum clearance or interference.