af•fectv. [[t]əˈfɛkt[/t]] n. [[t]ˈæf ɛkt[/t]] v. t.1) to produce an effect or change in:Cold weather affected the crops[/ex]2) to impress the mind or move the feelings of:The music affected him deeply[/ex]3) pat (of pain, disease, etc.) to attack or lay hold of4) psi feeling or emotion5) psi Psychiatry. an expressed or observed emotional response6) Obs. inward disposition or feeling•Etymology: 1350–1400; ME, < L affectus af•fect′a•ble, adj. af•fect`a•bil′i•ty, n. usage: Because of similarity in pronunciation, affect and effect are sometimes confused in writing. The spelling affect is used of two different words. The verb affect I means “to act on” or “to move” (His words affected the crowd so deeply that many wept); the noun affect I, pronounced with the stress on the first syllable, refers to emotion or, in psychiatry, emotional response. affect II is not used as a noun; as a verb it means “to pretend” or “to assume” (new students affecting a nonchalance they didn't feel). The verb effect means “to bring about, accomplish”: Her administration effected radical changes. The noun effect means “result, consequence”: the serious effects of the oil spill. IIaf•fect[[t]əˈfɛkt[/t]] v. t.1) to pretend or feign:to affect knowledge of history[/ex]2) to assume artificially, pretentiously, or for effect:to affect a British accent[/ex]3) to use, wear, or adopt by preference:to affect an outrageous costume[/ex]4) to assume the character or attitude of:to affect the freethinker[/ex]5) (of substances) to tend toward habitually or naturally:to affect colloidal form[/ex]6) archaica) to have affection forb) to aspire to7) Obs. to incline:She affects to the old ways[/ex]•Etymology: 1400–50; late ME < MF affecter < L affectāre af•fect′•er,n. syn: See pretend usage: See affect I .
From formal English to slang. 2014.