a sum of money allotted or granted for a particular purpose, as for expenses: Her allowance for the business trip was $200.
4.
a sum of money allotted or granted to a person on a regular basis, as for personal or general living expenses: The art student lived on an allowance of $300 a month. When I was in first grade, my parents gave me an allowance of 50 cents a week.
5.
an addition or deduction based on an extenuating or qualifying circumstance: an allowance for profit; an allowance for depreciation.
Machinery. a prescribed difference in dimensions of two closely fitting mating parts with regard to minimum clearance or maximum interference. Compare tolerance(def. 6a).
late 14c., "praise" (a sense now obsolete), from O.Fr. alouance, from alouer (see allow). Sense of "a sum alloted to meet expenses" is from mid-15c. In accounts, meaning "a sum placed to one's credit" is attested from 1520s. To make allowances is lit. to add or deduct a sum