rider
noun(rid-er)
a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
rider
noun(rid-er)
a clause that is appended to a legislative bill
rider
noun(rid-er)
a traveler who actively rides an animal (as a horse or camel)
rider
noun(rid-er)
a traveler who actively rides a vehicle (as a bicycle or motorcycle)