Glossary · Nouns · O
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TermTypeDefinitionClassificationsUpdated
Operating System FingerprintingnounMWEAnalyzing characteristics of packets sent by a target, such as packet headers or listening ports, to identify the operating system in use on the target.System
Operating TheaternounMWEa room in a hospital equipped for the performance of surgical operationsverified
Operating TheatrenounMWEa room in a hospital equipped for the performance of surgical operationsverified
Operation CodenounMWEthe portion of a set of operation descriptions that specifies the operation to be performedverified
operational controlnounMWEThe day-to-day security procedures and mechanisms to protect operational systems. The operational controls consist of the physical, environmental and personnel security controls. These controls deal with the everyday operation of a company or organization to ensure all objectives are achieved.ControlRegulated
operational exercisnounMWEAn action-based exercise where personnel rehearse reactions to an incident scenario, drawing on their understanding of plans and procedures, roles, and responsibilities.Process
operational exercisenounMWEAn action-based exercise where personnel rehearse reactions to an incident scenario, drawing on their understanding of plans and procedures, roles, and responsibilities.Process
Operational IT plannounMWETypically, the plans that are made by front-line, or low-level, IT managers. Operational IT plans are focused on the specific procedures and processes that implement the larger strategic plan.Process
Operational KeynounMWEKey intended for use over-the-air for protection of operational information or for the production or secure electrical transmission of key streams.CredentialRegulatedCUI
operational performance reportnounMWEA report that details the findings of a performance review of a business's operations.ArtifactInternal
operational resiliencenounMWEThe ability of an FMI to: (i) maintain essential operational capabilities under adverse conditions or stress, even if in a degraded or debilitated state; and (ii) recover to effective operational capability in a time frame consistent with the provision of critical economic services.CapabilityRegulated
Operational risknounMWEThe risk of failure or loss resulting from inadequate or failed processes, people, or systems.ThreatRegulated
Operational Vulnerability InformationnounMWEInformation that describes the presence of an information vulnerability within a specific operational setting or network.VulnerabilityRegulatedCUI
Operational WaivernounMWEAuthority for continued use of unmodified COMSEC end-items pending the completion of a mandatory modification.RequirementRegulatedCUI
Operationalismnounthe doctrine that the meaning of a proposition consists of the operations involved in proving or applying itverified
Operations CodenounMWECode composed largely of words and phrases suitable for general communications use.ArtifactRegulatedCUI
Operations SecuritynounMWESystematic and proven process by which potential adversaries can be denied information about capabilities and intentions by identifying, controlling, and protecting generally unclassified evidence of the planning and execution of sensitive activities. The process involves five steps: identification of critical information, analysis of threats, analysis of vulnerabilities, assessment of risks, and application of appropriate countermeasures.ProcessRegulatedCUI
Operations TechnologynounMWEThe hardware and software systems used to operate industrial control devices.SystemRegulated
OperatornounA role assumed by the person performing remote control or teleoperation, semi-autonomous operations, or other human-in-the-loop types of operationsRole
Operator GenenounMWEa gene that activates the production of messenger RNA by adjacent structural genesverified
Operculumnouna hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retractedverified
Operonnouna segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory geneverified
Ophryonnounthe craniometric point in the midline of the forehead immediately above the orbitsverified
Ophthalmic ArterynounMWEa branch of the internal carotid artery that supplies the eye and neighboring structuresverified
Ophthalmologistnouna medical doctor specializing in the diagnosis and treatment of diseases of the eyeverified
Opinion PollnounMWEan inquiry into public opinion conducted by interviewing a random sample of peopleverified
Opisthotonosnounsevere spasm in which the back arches and the head bends back and heels flex toward the backverified
Opossumnounnocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South Americaverified
Opossum ShrimpnounMWEshrimp-like crustaceans whose females carry eggs and young in a pouch between the legsverified
Opportunismnountaking advantage of opportunities without regard for the consequences for othersverified
Opportunistic InfectionnounMWEany infection caused by a microorganism that does not normally cause disease in humansverified
Opposite NumbernounMWEa person or thing having the same function or characteristics as anotherverified
Opposite WordnounMWEa word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each otherverified
Oppressionnounthe state of being kept down by unjust use of force or authority: 'after years of oppression they finally revolted'verified
Opsoninnounan antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytesverified
Opsonisationnounprocess whereby opsonins make an invading microorganism more susceptible to phagocytosisverified
Opsonizationnounprocess whereby opsonins make an invading microorganism more susceptible to phagocytosisverified
Opt-Innounan individual makes an active affirmative indication of choice via a user interface signaling a desire to share their information with third parties.RequirementRegulatedPII
Opt-Outnounan individual makes an active affirmative indication of choice via a user interface signaling a desire not to share their information with third parties.RequirementRegulatedPII
Optic AxisnounMWEa line that passes through the center of curvature of a lens so that light is neither reflected nor refractedverified
Optic ChiasmnounMWEthe crossing of the optic nerves from the two eyes at the base of the brainverified
Optic ChiasmanounMWEthe crossing of the optic nerves from the two eyes at the base of the brainverified
Optic CupnounMWE(embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retinaverified
Optical AberrationnounMWEan optical phenomenon resulting from the failure of a lens or mirror to produce a good imageverified
Optical DensitynounMWE(physics) a measure of the extent to which a substance transmits light or other electromagnetic radiationverified
Optical DiscnounMWEa disk coated with plastic that can store digital data as tiny pits etched in the surfaceverified
Optical DisknounMWEa disk coated with plastic that can store digital data as tiny pits etched in the surfaceverified