The Collaborative International Dictionary of English v.0.48:

Narrator \Nar*ra"tor\, n. [L.]
   One who narrates; one who relates a series of events or
   transactions.
   [1913 Webster]

WordNet (r) 3.0 (2006):

narrator
    n 1: someone who tells a story [syn: narrator, storyteller,
         teller]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "narrator":
   anecdotalist, anecdotist, annalist, author, chronicler, describer,
   fableist, fabler, fabulist, fictionist, mythmaker, mythopoet,
   novelettist, novelist, raconteur, reciter, recounter, relator,
   reporter, romancer, romancist, sagaman, short-story writer,
   spinner of yarns, storier, storyteller, taleteller,
   teller of tales, word painter, yarn spinner



Bouvier's Law Dictionary, Revised 6th Ed (1856):

NARRATOR. A pleader who draws narrs serviens narrator, a sergeant at law.
Fleta, 1. 2, c. 37. Obsolete.