navigation the right of way of the public over a river to use it as a highway.

• objects clause
• obligation
• obligationes literis
• obscenity
• occupation
• occupier of premises
• occupier's liability
• offence
• offences triable either way
• offensive weapon
• offer
• offer of amends
• office or employment
• Official Journal (OJ)
• Official Receiver
• official secrets
• offshore
• Ogden tables
• Oireachtas
• OJ
• Old Bailey
• ombudsman
• opening speeches
• open-texture
• open verdict