castcastcastscasting1verb (casts, casting, cast, has cast)to choose an actor for a particular part in a film or a play: She always seems to be cast in the same sort of role.cast a spellto use magic words that have the power to change somebody or something: The witch cast a spell on the handsome prince.castcastcasts2nounall the actors in a film, play, etc.: The whole cast was excellent.