Area, the
See deep seabed area.

• official secrets
• Official Solicitor
• OFT
• Ogden tables
• Old Bailey
• oligopoly
• Ombudsman
• omission
• omnia praesumuntur rite et solemniter esse acta
• on all fours with
• onomastic
• onus of proof
• onus probandi
• open contract
• open court
• open for signature
• opening speech
• open procedure
• open space
• open the floodgates
• operative mistake
• operative part
• operative words
• opinio juris
• opinion