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Meaning of mare nostrum*

ma•re nos•trum

Pronunciation: (mä're nōs'troom Eng. mâr'ē nos'tr&schwam, mär'ā), [key]
— Latin. Latin.
  1. our sea, esp. the Mediterranean to the ancient Romans.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.