MR

  1. (initialism) .  Short for MRI.
  2. (initialism) .  (education, special education) Mentally retarded.
  3. (abbreviation) .  An abbreviation of mister, a title used before the surname in theory, though not generally in practice, above some undefined social level, too old to be addressed as “Master”, not a knight or of some higher rank, and, in Britain though not in the United States, not entitled to be addressed as “Dr”.
  4. (abbreviation) .  (qualifier, month) March.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.