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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


(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.
References in periodicals archive ?
Pitt-Rivers, The Riddle of the Labarum and the Origin of Christian Symbolism (London, 1966).
9.00pm: 4-7 Smoking Baby, 3 Spenwood Babe, 4 No Blagging, 14 Churchtown Snap, 25 Labarum, 33 Brenton Wood
Thus, on a gold coin issued in 1042, the empress Zoe and her sister Theodora are represented frontally, holding between them the labarum,(20) the early Christian standard borne by Constantine the Great and Helena in countless mosaics, frescoes, and icons.
Se analizaron 431 ejemplares de Diplectrum labarum. De estos, 101 individuos de tallas entre 8.1 y 22.6cm de longitud total tenian contenido (Cuadro 2).
ORDEN PERCIFORMES SUBORDEN PERCOIDEI FAMILIA SERRANIDAE Diplectrum euryplectrum serrano extranjero II Jordan y Bollmann, 1890 Diplectrum labarum Rosenblatt serrano espinudo I,II,III,IV y Johnson, 1974 Diplectrum macropoma serrano mexicano I,IV (Gunther, 1864) Diplectrum maximum serrano de altura I,II,IV Hildebrand, 1946.
(87) Constantine had already offended them in 312 when he entered Rome with the labarum. (88) So, to avoid offending these locally dominant figures, Constantine built his huge basilicas on less visible lands that he, not the Senate, controlled.
9pm (50/25/10) Smoking Baby 35-38, Labarum 2-4, Spenwood Babe 17-20, No Blagging 17-20, Brenton Wood 1-3, Churchtown Snap 5-7
In 312, after a vision of the labarum accompanied by the motto, `In hoc signo vinces' (`In this sign you will conquer'), Constantine made it his standard in the struggle against his enemies.(5) In the period of peace and official recognition which was gradually established for the Christians (for earlier they were often persecuted), a mere spark -- a minor dispute between a priest and a bishop -- was to cause a conflagration, a veritable schism which lasted at least three centuries.
In addition to lapatum / laptum (see above), the OA tablets also use labarum / labirum to cite damage done to fabrics.