The definition of an outrider is an escort that goes in front of or next to a main vehicle.
An example of an outrider is the Secret Service car that drives in front of the president's car.
- an attendant on horseback who rides out ahead of or beside a carriage, stagecoach, etc.
- a cowboy who rides over a range, as to prevent cattle from straying
- a trailblazer; forerunner
- A guide; an escort.
- One that goes in advance; a forerunner.
- A mounted attendant who rides in front of or beside a carriage.
Middle English outridere