Source : Webster's Revised Unabridged Dictionary (1913)

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.