The Collaborative International Dictionary of English v.0.48:

Goodman \Good"man\, n. [Good + man]
   [1913 Webster]
   1. A familiar appellation of civility, equivalent to "My
      friend", "Good sir", "Mister;" -- sometimes used
      ironically. [Obs.]
      [1913 Webster]

            With you, goodman boy, an you please. --Shak.
      [1913 Webster]

   2. A husband; the master of a house or family; -- often used
      in speaking familiarly. [Archaic] --Chaucer.
      [1913 Webster]

            Say ye to the goodman of the house, . . . Where is
            the guest-chamber ?                   --Mark xiv.
                                                  14.
      [1913 Webster]

   Note: In the early colonial records of New England, the term
         goodman is frequently used as a title of designation,
         sometimes in a respectful manner, to denote a person
         whose first name was not known, or when it was not
         desired to use that name; in this use it was nearly
         equivalent to Mr. This use was doubtless brought with
         the first settlers from England.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mr \Mr.\ .
   The customary abbreviation of Mister in writing and printing.
   See Master, 4.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Mr.
    n 1: a form of address for a man [syn: Mister, Mr, Mr.]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MR
       Magneto - Resistive (HDD)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MR
       MODEM Ready (MODEM)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MR
       Modified Read (Fax)