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Used as a courtesy title before the name of a man in a Spanish-speaking area.
(noun)
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Chiefly British A head, tutor, or fellow at a college of Oxford or Cambridge.
(noun)
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Chiefly British A college or university professor.
(noun)
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The leader of an organized-crime family.
(noun)
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Archaic An important personage.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.