Also found in: Wikipedia.
n. pl. lab·a·ra (-ər-ə)
1. An ecclesiastical banner, especially one carried in processions.
2. The banner adopted by Constantine I after his conversion to Christianity.
[Late Latin, probably from alteration of Greek labrāton, laurel-leaf standard, from Latin laureātum, neuter of laureātus, adorned with laurel; see laureate.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -ra (-rə)
1. (Ecclesiastical Terms) a standard or banner carried in Christian religious processions
2. (Historical Terms) the military standard bearing a Christian monogram used by Constantine the Great
3. (Military) the military standard bearing a Christian monogram used by Constantine the Great
[C17: from Late Latin, of obscure origin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
lab•a•rum(ˈlæb ər əm)
n., pl. -a•ra (-ər ə)
the military standard of Constantine the Great and later Christian emperors of Rome, bearing Christian symbols.
[1650–60; < Late Latin; of obscure orig.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.