(idiomatic) An unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences. / (idiomatic) A special talent, ability or quality or its indefinable cause.

Alternative spelling of X factor

Alternative spelling of X factor

Alternative spelling of X factor

(informal, US) A film studio

plural of factice

(motor racing, of a team) Wholly or substantially supported by financial or technical backing from a car manufacturer, but not necessarily contracted to it.

(economics) A resource used to produce goods and services, such as labor, land, or capital.

(medicine, biochemistry) Any of several polypeptide hormones, produced by macrophages, that can destroy some cancer cells.

(historical) A far-left terrorist organization active from 1970 to 1998, mainly in West Germany.