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From The Collaborative International Dictionary of English v.0.48:
Outrider \Out"rid`er\, n. 1. A summoner whose office is to cite men before the sheriff. [Obs.] [1913 Webster] 2. One who rides out on horseback, beyond the main group, e. g., as a scout. --Chaucer. [1913 Webster +PJC] 3. A servant on horseback attending a carriage. [1913 Webster]