Definition of "outrider" []

• A guide; an escort. (noun)
• One that goes in advance; a forerunner. (noun)
• A mounted attendant who rides in front of or beside a carriage. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The idea of a "continuing coalition" was first floated by Nick Boles, the Tory MP, who is seen as an "outrider" for the group of Tory modernisers around Mr Cameron."
• "These days it seems carrying a party card does not disqualify you from being an outrider for a Tory government."
• "IBM is something of an outrider in tech's biggest trend."