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Mr.

[mis-ter]
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plural Messrs. [mes-erz] /ˈmɛs ərz/.
  1. mister: a title of respect prefixed to a man's name or position: Mr. Lawson; Mr. President.
  2. a title prefixed to a mock surname that is used to represent possession of a particular attribute, identity, etc., especially in an idealized or excessive way: Mr. Democrat; Mr. Perfect; Mr. Macho.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for mr.

Mr.

mid-15c., abbreviation of master (n.); also see mister. Used from 1814 with a following noun or adjective, to denote "the exemplar or embodiment of that quality" (e.g. Mr. Right "the only man a woman wishes to marry," 1826; Mr. Fix-It, 1912; Mr. Big, 1940). The plural Messrs. (1779) is an abbreviation of French messieurs, plural of monsieur, used in English to supply the plural of Mr., which is lacking.

Online Etymology Dictionary, © 2010 Douglas Harper