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Originally Posted by Island Lover
You dictionary definition is correct. Now check out the engineering definition for tolerance. "Permissible deviation" is another way to express an "inexact result adequate for a given purpose"
tol·er·ance (tlr-ns)
n.
a. The permissible deviation from a specified value of a dimension, often expressed as a percent
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Ah, the crux of the matter. A tolerance is needed because the number presented is not absolute. In other words it could have been 28, it could have been 25, it could have been 20, it could have been 30.
Now that wasn't that hard to admit, was it?