The act of appearing or performing as a guest; a guest appearance.
Present participle and gerund of 'guest' (as a verb). The noun form 'guesting' emerged in entertainment industry jargon in the mid-20th century.
In television and entertainment, 'guesting' became a technical term for a specific type of work—a guest star's one-episode appearance—showing how specialized communities develop vocabulary for their needs, turning simple verbs into industry jargon.
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