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1610s, from Latin narrator "a relater, narrator, historian," agent noun from narrat-, stem of narrare "to tell, relate" (see narration). In sense of "a commentator in a radio program" it is from 1941.
one who tells a story. In a work of fiction the narrator determines the story's point of view. If the narrator is a full participant in the story's action, the narrative is said to be in the first person. A story told by a narrator who is not a character in the story is a third-person narrative.