As for the rest of the time--when I'm watching ballroom-dancing competitions and searching for batteries for my Bop It and extracting all the sopapilla pieces from a gallon of limited edition cinnamon ice cream with the precision of a brain surgeon--there's no real excuse.
Definition of ALLOWANCE: A deduction, an average payment, a portion assigned or allowed: the act of allowing. The Law Dictionary Featuring Black's Law Dictionary Free Online Legal Dictionary 2nd Ed. Navigation
Allowance, in simple words, is nothing but the scope given for adjustment of dimensional errors of mating components. It is the planned deviation Between actual dimension and desired dimension. Clearance or interference are basically type of fits.