The Collaborative International Dictionary of English v.0.48:

Khan \Khan\, n. [Pers. & Tart. kh[=a]n.] [Also kan, kaun.]
   A king; a prince; a chief; a governor; -- so called among the
   Tartars, Turks, and Persians, and in countries now or
   formerly governed by them.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Khan \Khan\, n. [Per. kh[=a]n, kh[=a]nah, house, tent, inn.]
   An Eastern inn or caravansary. [Written also kawn.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cham \Cham\ (k[a^]m), n. [See Khan.]
   The sovereign prince of Tartary; -- now usually written
   khan. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

khan
    n 1: a title given to rulers or other important people in Asian
         countries
    2: an inn in some eastern countries with a large courtyard that
       provides accommodation for caravans [syn: caravansary,
       caravanserai, khan, caravan inn]