Abbreviation of Rhesus factor.

(mathematics) A number that can be divided into two different numbers, without leaving a remainder.

(slang) The element of a situation or problem that should be obvious but may go unnoticed through human error.

(US, slang) An intangible quality, usually attributed to certain items of professional equipment but sometimes to particular positions within predominantly and traditionally male professions such as law enforcement and the military where the term is most frequently used, that is believed to stir inordinate interest in obtaining the item or position because it makes the possessor feel confident, cool and thus desirable to women.

In management accounting, a constraint that limits the business from achieving a higher level of profitability.

plural of factor market

(physics) A probability factor for the chance of two nuclear particles overcoming the Coulomb barrier in order to undergo nuclear reactions.

(physics) A rescaling of a nuclear reaction's total cross section to account for the Coulomb repulsion between the charged reactants. It determines the rates of nuclear fusion reactions that occur in the cores of stars.

(physics) Synonym of Gamow factor

(aviation) The load factor necessary for an airline to break even. It is a function of the percent of seats filled at a particular yield versus the airlines operating costs.