The Collaborative International Dictionary of English v.0.48:

passenger \pas"sen*ger\ (p[a^]s"s[e^]n*j[~e]r), n. [OE. & F.
   passager. See Passage, and cf. Messenger.]
   1. A passer or passer-by; a wayfarer. --Shak.
      [1913 Webster]

   2. A traveler by some established conveyance, as a coach,
      steamboat, railroad train, etc.
      [1913 Webster]

   Passenger falcon (Zool.), a migratory hawk. --Ainsworth.
      [1913 Webster]

WordNet (r) 3.0 (2006):

passenger
    n 1: a traveler riding in a vehicle (a boat or bus or car or
         plane or train etc) who is not operating it [syn:
         passenger, rider]