Source : Webster's Revised Unabridged Dictionary (1913)

Mrs \Mrs.\
   The customary abbreviation of Mistress when used as a title
   of courtesy, in writing and printing.

Source : WordNet®

Mrs
     n : a form of address for a married woman

Source : Free On-Line Dictionary of Computing

MRS
     
        Modifiable Representation System.
     
        An integration of {logic programming} into {Lisp}.
     
        ["A Modifiable Representation System", M. Genesereth et al,
        HPP 80-22, CS Dept Stanford U 1980].
     
        (1994-11-08)