Definitions of rider:
- noun: a clause that is appended to a legislative bill
- noun: a traveler who actively rides an animal (as a horse or camel)
- noun: a traveler who actively rides a vehicle (as a bicycle or motorcycle)
- noun: a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
- name: A surname (common: 1 in 20000 families; popularity rank in the U.S.: #2410)