from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A useful principle having wide application but not intended to be strictly accurate or reliable in every situation.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A general
guideline, rather than a strict rule; an approximatemeasure or means of reckoningbased on experience or common knowledge.
- noun attributive, usually hyphenated
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a rule or principle that provides guidance to appropriate behavior
from The American Heritage® Dictionary of the English Language, 4th Edition
[From the use of the thumb as a makeshift ruler or measuring device, as in carpentry.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
Michael Quinion lists the first documented use as 1692 while The Oxford English Dictionary puts the first documented use at 1685. Some suggested origins include the fact that the inch originated as the distance between the base of the thumbnail and the first joint, the practice of approximating the general direction of the wind by wetting the thumb then raising it in the air, and the rule of English Royal banquet plate setters using the distance of the thumb to equally space each plate from the table edge. Apocryphally, it has been claimed the term originally referred to the maximum thickness of a stick with which it was permissible for a man to beat his wife, but the earliest use in direct reference to domestic violence may be Del Martin’s 1976 book Battered Wives.
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