life peerˌlife ˈpeer noun [countable] 
someone who has the rank of a British peer (=lord or lady) but who cannot pass it on to their children
someone who has the rank of a British peer (=lord or lady) but who cannot pass it on to their children- operational research
- Operation Desert Storm
- Operation Iraqi Freedom
- Operation Overlord
- operative
- operator
- operetta
- Ophelia
- ophthalmic
- ophthalmologist
- ophthalmology
- opiate
- opine
- opinion
- opinionated
- opinion-makers
- opinion poll
- opium
- opossum
- opp.
- Oppenheimer, J. Robert
- opponent
- opportune
- opportunely
- opportunism