(Britain, Ireland, chiefly in the plural) A retail supplier of car parts and accessories.

(number theory) A factor of a given integer which is also a prime number.

(physics) a factor arising frequently in special relativity, to calculate the degree of time dilation, length contraction and relativistic mass of an object moving relative to an observer, defined as (1-v²/c²)^(-0.5), where v and c are relative velocity and the speed of light, respectively

(transitive) to reduce an integer to its set of prime factors.

The sleazy or sordid aspect of a political situation. / The corrupt or tainted element of a political party or administration.

(idiomatic, engineering) A quantity introduced to compensate for uncertainty. / (idiomatic) Any padding or compensation built into a guess or estimate.

A factor that encourages one to leave one's current home, region, country, organization, or religion.

(economics) The phenomenon whereby many small purchases add up to a significant expenditure over time.

(in an electromagnetic coil) The ratio of the volume occupied by the wire in the winding, or the iron in the core, to the total volume of the winding or the core

A measure of the quality of an electric circuit; the ratio of the reactance to the resistance.