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Meaning of cognomen

cog•no•men

Pronunciation: (kog-nō'mun), [key]
— pl. -no•mens, -nom•i•na
  1. a surname.
  2. any name, esp. a nickname.
  3. the third and commonly the last name of a citizen of ancient Rome, indicating the person's house or family, as “Caesar” in “Gaius Julius Caesar.” Cf. agnomen (def. 1).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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