o/n or O.N.

Official Number (of a vessel)

occ

occupied

oct

October

Ogwell

Ogwell, Devon, England

Ogwell

Ogwell, Devon Parish Records, England

okehampton

Okehampton, Devon, England

okehampton

Okehampton, Devon Parish Records, England

old perlican uc

Old Perlican United Church Parish Records, Trinity Bay, Newfoundland

old/resp

old and respected

OP

Old Perlican, Trinity Bay, Newfoundland

oporto

Oporto, Portugal

ostend

Oostende, Belgium

Otterbury

Otterbury, Conception Bay, Newfoundland

own

owner

Oyer/Terminer

Great Britain. High Court of Admiralty. HCA 1. Vol. #. Oyer and Terminer Records. Proceedings in trials for piracy and other crimes committed on the high seas. 1535-1834. 101 Volumes and Bundles [Oyer and Terminer, a commission authorizing a British judge to hear and deterimine a criminal case at the assizes (former periodical sessions of the superior courts in England used for trial of civil and criminal cases)]