Webster's English Dictionary

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mister

mis.ter \'mis-t*r\ n [alter. of master] 1a: - used as a title prefixed to 
   the name of a man or to a designation o f occupation or office and usu. 
   written Mr. or in the plural Messrs. 1b: - used before the name of a place 
   or of a line of activity or before  some epithet to form a title for a male 
   viewed as representative of the thing indicated {Mr. Baseball} 2: SIR - 
   used without a name as a conventional term of address to a  man 3: a man 
   not entitled to a title of rank or an honorific or professional ti tle 
   {just a plain ~} 4: HUSBAND