(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.

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

(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

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

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.

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

(science fiction) A hypothetical figure describing a speed of one light-year per hour.

(idiomatic) The emotional dimension of decision-making. A person's subjective (often almost visceral) feelings about what is right or wrong, good or bad.