A visual or acoustic device used to convey atmosphere or the illusion of reality in the production of plays, films, or broadcasts (now usually in p…

an unusual or spectacular illusion or other audio-visual effect; (in later use) esp. a scenic or optical effect created on set using camerawork…

(originally) a scenic or optical illusion created on set using camerawork, stunts, pyrotechnics, props, etc. (see special effect n. at special, adj.…

Film and Television. An optical effect created in a processing laboratory.

Effects (see effect, n. 4c) used in a broadcast, film, show, etc. spec. Chiefly Film. Special (visual) effects (see special effect n. at special, adj.…

With plural (or occasionally singular agreement). Visual effects (cf. FX, n. 1b, SFX, n.2). Frequently attributive.