(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.
4(television, video) A brief portion of a television episode or video that is shown at the beginning, often before the main titlesequence, meant to introduce the story and entice viewers to watch the rest of the episode.