- out of print.
- Order of Preachers (Dominican).
Origin of O.P.1
From the Latin word Ōrdō Praedicātōrum
- observation post.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- out of print
- military observation post
- Ordo Praedicatorum (the Dominicans)
(for sense 2) Latin: Order of Preachers