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Order of Preachers (Dominican).
Origin of O.P.1
From the Latin word Ōrdō Praedicātōrum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
out of print
military observation post
Ordo Praedicatorum (the Dominicans)
Word Origin for OP
(for sense 2) Latin: Order of Preachers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012