WordReference Random House Unabridged Dictionary of American English © 2020
ag•no•men  (ag nōmən),USA pronunciation n., pl.  -nom•i•na 
    (ag nōmən),USA pronunciation 
  1. Ancient History, Antiquityan additional, fourth name given to a person by the ancient Romans in allusion to some achievement or other circumstance, as "Africanus'' in "Publius Cornelius Scipio Africanus.'' Cf. cognomen (def. 3).
  2. a nickname.
ag•nom•i•nal  (ag nōmən),USA pronunciation adj. 
  • Late Latin, equivalent. to ad- ad- + nōmen name, with alteration to ag- through influence of agnōscere; see agnize
  • 1745–55;

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