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- Operation Starvation
- Operation Starvation/Definition
- Operation Starvation/Related Articles
- Operation Sunrise
- Operation Sunrise/Definition
- Operation Sunrise/Related Articles
- Operation Telic
- Operation Telic/Definition
- Operation Torch
- Operation Torch/Bibliography
- Operation Torch/Definition
- Operation Torch/Related Articles
- Operation Vittles
- Operation Vittles/Approval
- Operation Vittles/Definition
- Operation Vittles/Related Articles
- Operational Maneuver Group
- Operational Maneuver Group/Definition
- Operational Preparation of the Battlespace
- Operational Preparation of the Battlespace/Related Articles
- Operational Preparation of the Environment
- Operational Preparation of the Environment/Definition
- Operational Preparation of the Environment/Related Articles
- Operational amplifier
- Operational amplifier/Definition
- Operational amplifier/Related Articles
- Operational planning/Definition
- Operations research
- Operations research/Definition
- Operations research/External Links
- Operations research/Related Articles
- Operations security
- Operations security/Definition
- Operations security/Related Articles
- Operator (disambiguation)
- Opeth
- Opeth/Approval
- Opeth/Definition
- Opeth/External Links
- Opeth/Related Articles
- Ophiuchus
- Ophiuchus/Approval
- Ophiuchus/Definition
- Ophiuchus/Related Articles
- Ophthalmoscope
- Ophthalmoscope/Definition
- Ophthalmoscope/Related Articles
- Opiate dependence
- Opihi
- Opihi/Definition
- Opioid analgesic
- Opioid analgesic/Definition
- Opioid analgesic/Related Articles
- Opioid anesthetic
- Opioid anesthetic/Definition
- Opioid receptor
- Opioid receptor/Definition
- Opioid receptor/Related Articles
- Opium
- Opium/Definition
- Opium/Related Articles
- Opium Wars
- Opium Wars/Definition
- Opportunistic encryption
- Opportunistic encryption/Definition
- Opportunistic encryption/External Links
- Opportunistic encryption/Related Articles
- Opportunity cost
- Opportunity cost/Approval
- Opportunity cost/Bibliography
- Opportunity cost/Definition
- Opportunity cost/External Links
- Opportunity cost/Related Articles
- Opposition (disambiguation)
- Opsonins
- Opsonins/Definition
- Opsonins/Related Articles
- Opthalmology
- Opthalmology/Definition
- Optic chiasm
- Optic chiasm/Definition
- Optic chiasm/Related Articles
- Optic nerve glioma
- Optic nerve glioma/Definition
- Optic tectum
- Optic tectum/Bibliography
- Optic tectum/Definition
- Optic tectum/External Links
- Optic tectum/Related Articles
- Optical Disc
- Optical Disc/Approval
- Optical Disc/Definition
- Optical Disc/Related Articles
- Optical measurement of nuclear explosions MASINT/Definition
- Optics
- Optics/Definition
- Optimization (computer science)
- Optimization (computer science)/Approval
- Optimization (computer science)/Definition
- Optimization (computer science)/Related Articles
- Optimization (disambiguation)
- Optimization (mathematics)
- Optimization (mathematics)/Approval
- Optimization (mathematics)/Catalogs
- Optimization (mathematics)/Definition
- Optimization (mathematics)/External Links
- Optimization (mathematics)/Related Articles
- Option
- Option/Approval
- Option/Definition
- Option/Related Articles
- Optoisolator
- Optoisolator/Definition
- Opus Dei
- Opus Dei/Approval
- Opus Dei/Definition
- Opus Dei/External Links
- Opus Dei/Related Articles
- Opération Daguet/Definition
- Oracle (computer software)
- Oracle (computer software)/Approval
- Oracle (computer software)/Definition
- Oracle (computer software)/Related Articles
- Oral History
- Oral History/Approval
- Oral History/Bibliography
- Oral History/Definition
- Oral History/External Links
- Oral History/Related Articles
- Oral drug administration
- Oral drug administration/Definition
- Oralloy/Definition
- Orange (colour)
- Orange (colour)/Definition
- Orange (disambiguation)
- Orange (fruit)
- Orange (fruit)/Approval
- Orange (fruit)/Definition
- Orange (fruit)/Related Articles
- Orange Order
- Orange Order/Approval
- Orange Order/Definition
- Orange Order/External Links
- Orange Order/Related Articles
- Orange Revolution
- Orange Revolution/Approval
- Orange Revolution/Definition
- Orange Revolution/Related Articles
- Orbis
- Orbis/Definition
- Orbit
- Orbit/Definition
- Orbit/Related Articles
- Orbital-angular momentum
- Orbital-angular momentum/Definition
- Orbital (disambiguation)
- Orbital hybridisation
- Orbital hybridisation/Approval
- Orbital hybridisation/Definition
- Orbital hybridisation/Related Articles
- Orbitofrontal Cortex
- Orbitofrontal Cortex/Approval
- Orbitofrontal Cortex/Definition
- Orch-OR
- Orch-OR/Approval
- Orch-OR/Bibliography
- Orch-OR/Definition
- Orch-OR/External Links
- Orch-OR/Related Articles
- Orchestra
- Orchestra/Bibliography
- Orchestra/Catalogs
- Orchestra/Catalogs/Youth orchestras in the United States
- Orchestra/Definition
- Orchestra/External Links
- Orchestra/Related Articles
- Orchestral music
- Orchestral music/Definition
- Orchestral music/Related Articles
- Orchid
- Orchid/Approval
- Orchid/Bibliography
- Orchid/Catalogs
- Orchid/Catalogs/Orchidologists
- Orchid/Catalogs/Taxonomy
- Orchid/Citable Version
- Orchid/Definition
- Orchid/External Links
- Orchid/Related Articles
- Orchidaceae/Definition
- Orchidaceae/Related Articles/Masterlist
- Orchidoideae/Definition
- Order (biology)/Definition
- Order (disambiguation)
- Order (group theory)
- Order (group theory)/Definition
- Order (group theory)/Related Articles
- Order (mathematics)
- Order (organization)
- Order (organization)/Definition
- Order (relation)
- Order (relation)/Bibliography
- Order (relation)/Definition
- Order (relation)/Related Articles
- Order (ring theory)
- Order (ring theory)/Definition
- Order (ring theory)/Related Articles
- Order parameter
- Order parameter/Definition
- Order parameter/Related Articles
- Ordered field
- Ordered field/Bibliography
- Ordered field/Definition
- Ordered field/Related Articles
- Ordered pair
- Ordered pair/Definition
- Ordered pair/Related Articles
- Ordered set/Definition
- Ordered structure
- Ordered structure/Definition
- Ordesa and Monte Perdido National Park
- Ordesa and Monte Perdido National Park/Definition
- Ordinal number/Definition
- Ordinary share
- Ordinary share/Definition
- Ordnance
- Ordnance/Definition
- Ordo Templi Orientis
- Ordo Templi Orientis/Approval
- Ordo Templi Orientis/Definition
- Ordo Templi Orientis/Related Articles
- Oregon (U.S. state)
- Oregon (U.S. state)/Approval
- Oregon (U.S. state)/Bibliography
- Oregon (U.S. state)/Definition
- Oregon (U.S. state)/External Links
- Oregon (U.S. state)/Related Articles
- Oregon (disambiguation)
- Oregon City-class
- Oregon City-class/Definition
- Oregon Responder
- Oregon Responder/Definition
- Oren E. Long
- Oresteia
- Oresteia/Definition
- Orestes
- Orestes/Definition
- Organ biophysics
- Organ biophysics/Definition
- Organ theory of government
- Organ theory of government/Definition
- Organ theory of government/Related Articles
- Organelle
- Organelle/Approval
- Organelle/Definition
- Organelle/Related Articles
- Organic chemistry
- Organic chemistry/Approval
- Organic chemistry/Definition
- Organic chemistry/External Links
- Organic chemistry/Related Articles
- Organic nitrate explosives
- Organic nitrate explosives/Definition
- Organic nitrate explosives/Related Articles
- Organic reaction
- Organic reaction/Approval
- Organic reaction/Catalogs
- Organic reaction/Definition
- Organic reaction/Related Articles
- Organisation for Security and Cooperation in Europe
- Organisation for Security and Cooperation in Europe/Definition
- Organism
- Organism/Approval
- Organism/Definition
- Organism/External Links
- Organism/Related Articles
- Organization for Human Brain Mapping
- Organization for Human Brain Mapping/Definition
- Organization for Human Brain Mapping/Related Articles
- Organization of the Islamic Conference
- Organization of the Islamic Conference/Approval
- Organization of the Islamic Conference/Related Articles