rule of thumb
- The definition of a rule of thumb is a generally accepted guideline, policy or method of doing something based on practice rather than facts.
An example of a rule of thumb is the general guideline that you don't wear white after Labor Day.
rule of thumb definition by Webster's New World
- a rule based on experience or practice rather than on scientific knowledge
- any method of estimating that is practical though not precise
Origin: from the method of measuring by the thumb
rule of thumb definition by American Heritage Dictionary
rule of thumb - Computer Definition
A rule, or guideline, based on experience and sound judgement rather than scientific knowledge.The origin of the term is vague, but some suggest that it originated in the practice of carpenters, seamstresses, artists, and other craftsmen of using their thumb to approximate measurements.The fact that the measurement of an inch is based on the distance between the thumbnail and the first joint certainly lends credence to this theory.
rule of thumb - Cultural Definition
A practical principle that comes from the wisdom of experience and is usually but not always valid: “When playing baseball, a good rule of thumb is to put your best hitter fourth in the batting order.”