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Meaning of labarum

lab•a•rum

Pronunciation: (lab'ur-um), [key]
— pl. -a•ra
  1. an ecclesiastical standard or banner, as for carrying in procession.
  2. the military standard of Constantine the Great and later Christian emperors of Rome, bearing Christian symbols.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.