noun (n)

• a traveler who actively rides an animal (as a horse or camel)(noun.person)

  source: wordnet30
• a clause that is appended to a legislative bill(noun.communication)

  source: wordnet30
• a traveler who actively rides a vehicle (as a bicycle or motorcycle)(noun.person)

  source: wordnet30
• a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it(noun.person)

  Synonym:
  passenger
  

  source: wordnet30
• One who, or that which, rides.(noun)

  source: webster1913