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Meaning of ex libris

ex li•bris

Pronunciation: (eks lē'bris, lī'-), [key]
— pl. -bris
  1. from the library of (a phrase inscribed in or on a book before the name of the owner): Ex libris Jane Doe.
  2. an inscription in or on a book, to indicate the owner; bookplate.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.