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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.

Search results for 'op':

OP abbreviation 1 military observation post; observation point. 2 theat opposite prompt. 3 Ordo Praedicatorum (Latin), Order of Preachers, the Dominican Order.

op noun, colloq 1 a surgical operation. 2 a military operation.
ETYMOLOGY: 1920s short form.

op. abbreviation opus.