Source : Webster's Revised Unabridged Dictionary (1913)

Mr \Mr.\ .
   The customary abbreviation of Mister in writing and printing.
   See {Master}, 4.

Source : WordNet®

Mr
     n : a form of address for a man [syn: {mister}]

Source : Free On-Line Dictionary of Computing

mr
     
         The {country code} for Mauritania.
     
        (1999-01-27)