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Glossary · Nouns · I

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TermTypeDefinitionClassificationsUpdated
Isogonnounan equiangular polygonverifiedMay 18, 2026
Isogonal LinenounMWEan imaginary line connecting points on the Earth's surface where the magnetic declination is the sameverifiedMay 18, 2026
Isogonenounan imaginary line connecting points on the Earth's surface where the magnetic declination is the sameverifiedMay 18, 2026
Isogonic LinenounMWEan imaginary line connecting points on the Earth's surface where the magnetic declination is the sameverifiedMay 18, 2026
Isogramnouna line drawn on a map connecting points having the same numerical value of some variableverifiedMay 18, 2026
Isohelnounan isogram connecting points receiving equal amounts of sunshineverifiedMay 18, 2026
Isolationnoun(psychiatry) a defense mechanism in which memory of an unacceptable act or impulse is separated from the emotion originally associated with itverifiedMay 18, 2026
Isolationismnouna policy of nonparticipation in international economic and political relationsverifiedMay 18, 2026
Isoleucinenounan essential amino acid found in proteinsverifiedMay 18, 2026
Isomernouna compound that exists in forms having different arrangements of atoms but the same molecular weightverifiedMay 18, 2026
Isomerasenounan enzyme that catalyzes its substrate to an isomeric formverifiedMay 18, 2026
Isomerisationnounthe conversion of a compound into an isomer of itselfverifiedMay 18, 2026
Isomerismnounthe state of being an isomerverifiedMay 18, 2026
Isomerizationnounthe conversion of a compound into an isomer of itselfverifiedMay 18, 2026
Isometric ExercisenounMWEmuscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change)verifiedMay 18, 2026
Isometric LinenounMWEa line connecting isometric pointsverifiedMay 18, 2026
Isometropianounequality of refractive power in the two eyesverifiedMay 18, 2026
Isometrynouna one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of pointsverifiedMay 18, 2026
Isomorphismnoun(biology) similarity or identity of form or shape or structureverifiedMay 18, 2026
Isomorphynoun(biology) similarity or identity of form or shape or structureverifiedMay 18, 2026
Isoniazidnounantibacterial drug (trade name Nydrazid) used to treat tuberculosisverifiedMay 18, 2026
Isoplethnouna line drawn on a map connecting points having the same numerical value of some variableverifiedMay 18, 2026
Isopodnounany of various small terrestrial or aquatic crustaceans with seven pairs of legs adapted for crawlingverifiedMay 18, 2026
Isopropanolnounalcohol used as antifreeze or a solventverifiedMay 18, 2026
Isopropyl AlcoholnounMWEalcohol used as antifreeze or a solventverifiedMay 18, 2026
Isoproterenolnoundrug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heartverifiedMay 18, 2026
Isosceles TrianglenounMWEa triangle with two equal sidesverifiedMay 18, 2026
Isosmotic SolutionnounMWEa solution having the same osmotic pressure as bloodverifiedMay 18, 2026
Isosorbidenoundrug (trade name Isordil) used to treat angina pectoris and congestive heart failureverifiedMay 18, 2026
Isostasynoun(geology) a general equilibrium of the forces tending to elevate or depress the earth's crustverifiedMay 18, 2026
Isothermnoun(meteorology) an isogram connecting points having the same temperature at a given timeverifiedMay 18, 2026
Isothiocyanatenouna family of compounds derived from horseradish and radishes and onions and mustardsverifiedMay 18, 2026
Isotonic ExercisenounMWEexercise in which opposing muscles contract and there is controlled movement (tension is constant while the lengths of the muscles change)verifiedMay 18, 2026
Isotonic SolutionnounMWEa solution having the same osmotic pressure as bloodverifiedMay 18, 2026
Isotopenounone of two or more atoms with the same atomic number but with different numbers of neutronsverifiedMay 18, 2026
Isotropynoun(physics) the property of being isotropicverifiedMay 18, 2026
Issuancenounthe act of providing an item for general use or for official purposes (usually in quantity)verifiedMay 18, 2026
issuenounAn important question, point, or problem to be disputed, discussed, or decided.FindingMay 12, 2026
Issue-Specific PolicynounMWEAn Issue-Specific Policy is intended to address specific needs within an organization, such as a password policy.RequirementMay 9, 2026
Issuernounan institution that issues something (securities or publications or currency etc.)verifiedMay 18, 2026
Issuingnounthe act of providing an item for general use or for official purposes (usually in quantity)verifiedMay 18, 2026
Isthmusnouna relatively narrow strip of land with water on both sides connecting two larger land areasverifiedMay 18, 2026
IT architecturenounMWEA subset of enterprise architecture, with detail to support data processing and access, including fundamental requirements for centralized or distributed computing, real or virtual servers, devices and workstations, and networking design. Architecture plans may also exist for data (information), security, and applications.FrameworkMay 9, 2026
IT governancenounMWEAn integral part of governance that consists of the leadership and organizational structures and processes that ensure that the institution's IT sustains and extends the organization's strategies and objectives.ProcessMay 9, 2026
IT Security ArchitecturenounMWEA description of security principles and an overall approach for complying with the principles that drive the system design; i.e., guidelines on the placement and implementation of specific security services within various distributed computing environments.FrameworkMay 12, 2026
IT Security AwarenessnounMWEThe purpose of awareness presentations is simply to focus attention on security. Awareness presentations are intended to allow individuals to recognize IT security concerns and respond accordingly.CapabilityMay 9, 2026
IT Security Awareness and Training ProgramnounMWEExplains proper rules of behavior for the use of agency information systems and information. The program communicates IT security policies and procedures that need to be followed (i.e., NSTISSD 501, NIST SP 800-50).ProcessRegulatedCUIMay 12, 2026
IT Security EducationnounMWEIT Security Education seeks to integrate all of the security skills and competencies of the various functional specialties into a common body of knowledge, adds a multidisciplinary study of concepts, issues, and principles (technological and social), and strives to produce IT security specialists and professionals capable of vision and proactive response.ProcessMay 9, 2026
IT Security InvestmentnounMWEAn IT application or system that is solely devoted to security. For instance, intrusion detection systems (IDS) and public key infrastructure (PKI) are examples of IT security investments.CapabilityMay 9, 2026
IT Security MetricsnounMWEMetrics based on IT security performance goals and objectives.MetricMay 12, 2026
IT Security PolicynounMWEThe “documentation of IT security decisions” in an organization. NIST SP 800-12 categorizes IT Security Policy into three basic types: 1) Program Policy—high-level policy used to create an organization’s IT security program, define its scope within the organization, assign implementation responsibilities, establish strategic direction, and assign resources for implementation. 2) Issue-Specific Policies—address specific issues of concern to the organization, such as contingency planning, the use of a particular methodology for systems risk management, and implementation of new regulations or law. These policies are likely to require more frequent revision as changes in technology and related factors take place. 3) System-Specific Policies—address individual systems, such as establishing an access control list or in training users as to what system actions are permitted. These policies may vary from system to system within the same organization. In addition, policy may refer to entirely different matters, such as the specific managerial decisions setting an organization’s electronic mail (email) policy or fax security policy.RequirementMay 9, 2026
IT Security TrainingnounMWEIT Security Training strives to produce relevant and needed security skills and competencies by practitioners of functional specialties other than IT security (e.g., management, systems design and development, acquisition, auditing). The most significant difference between training and awareness is that training seeks to teach skills, which allow a person to perform a specific function, while awareness seeks to focus an individual’s attention on an issue or set of issues. The skills acquired during training are built upon the awareness foundation, in particular, upon the security basics and literacy material.ProcessMay 9, 2026
IT strategic plannounMWEA comprehensive blueprint that guides the organization's technology management and contains high-level goals and plans for all areas of information technology that affect the business, not just the infrastructure. The plan should include areas that impact technology management, including cost management, human capital management, hardware and software management, third-party management, risk management, and all other considerations in the enterprise IT environment.ArtifactInternalMay 9, 2026
IT system inventorynounMWEA list containing information about the information resources owned or operated by an organization.ArtifactInternalMay 9, 2026
IT-Related RisknounMWEThe net mission/business impact considering 1) the likelihood that a particular threat source will exploit, or trigger, a particular information system vulnerability, and 2) the resulting impact if this should occur. IT-related risks arise from legal liability or mission/business loss due to, but not limited to: - Unauthorized (malicious, non-malicious, or accidental) disclosure, modification, or destruction of information; - Non-malicious errors and omissions; - IT disruptions due to natural or man-made disasters; or - Failure to exercise due care and diligence in the implementation and operation of the IT.MetricMay 9, 2026
Itaconic AcidnounMWEa crystalline carboxylic acidverifiedMay 18, 2026
Itch MitenounMWEwhitish mites that attack the skin of humans and other animalsverifiedMay 18, 2026
Itchinessnounan irritating cutaneous sensation that produces a desire to scratchverifiedMay 18, 2026
Itchingnounan irritating cutaneous sensation that produces a desire to scratchverifiedMay 18, 2026
Itchy FeetnounMWEvery strong or irresistible impulse to travelverifiedMay 18, 2026
Itemnouna distinct part that can be specified separately in a group of things that could be enumerated on a listverifiedMay 18, 2026
Itemisationnounthe act of making a list of itemsverifiedMay 18, 2026
Itemizationnounthe act of making a list of itemsverifiedMay 18, 2026
Iterationnoun(computer science) executing the same set of instructions a given number of times or until a specified result is obtainedverifiedMay 18, 2026
IterativenounRepetitive or cyclical. Iterative software development involves the completion of project tasks or phases in repetitive cycles. Tasks and phase activities are repeated until a desired result is achieved.ProcessMay 12, 2026
Iterative AspectnounMWEthe aspect of the verb that expresses the repetition of an actionverifiedMay 18, 2026
Itinerarynounan established line of travel or accessverifiedMay 18, 2026
Itinerationnounjourneying from place to place preaching or lecturingverifiedMay 18, 2026
Itraconazolenounan oral antifungal drug (trade name Sporanox) taken for cases of fungal nail diseaseverifiedMay 18, 2026
ITU-TnounInternational Telecommunications Union, Telecommunication Standardization Sector (formerly "CCITT"), a United Nations treaty organization that is composed mainly of postal, telephone, and telegraph authorities of the member countries and that publishes standards called "Recommendations."OrganizationMay 9, 2026
Ivorynouna hard smooth ivory colored dentine that makes up most of the tusks of elephants and walrusesverifiedMay 18, 2026
Ivory BlacknounMWEa black pigment made from grinding burnt ivory in oilverifiedMay 18, 2026
Ivory GullnounMWEwhite Arctic gullverifiedMay 18, 2026
Ivory NutnounMWEnutlike seed of a South American palmverifiedMay 18, 2026
Ivory PalmnounMWEa stemless palm tree of Brazil and Peru bearing ivory nutsverifiedMay 18, 2026
Ivory PlantnounMWEa stemless palm tree of Brazil and Peru bearing ivory nutsverifiedMay 18, 2026
Ivory TowernounMWEa state of mind that is discussed as if it were a placeverifiedMay 18, 2026
Ivory TreenounMWEtropical Asian tree with hard white wood and bark formerly used as a remedy for dysentery and diarrheaverifiedMay 18, 2026
Ivory-Billed WoodpeckernounMWElarge black-and-white woodpecker of southern United States and Cuba having an ivory billverifiedMay 18, 2026
Ivory-Nut PalmnounMWEa stemless palm tree of Brazil and Peru bearing ivory nutsverifiedMay 18, 2026
Ivorybillnounlarge black-and-white woodpecker of southern United States and Cuba having an ivory billverifiedMay 18, 2026
IvynounOld World vine with lobed evergreen leaves and black berrylike fruitsverifiedMay 18, 2026
Ivy ArumnounMWEevergreen liana widely cultivated for its variegated foliageverifiedMay 18, 2026
Ivy FamilynounMWEmostly tropical trees and shrubs and lianas: genera Panax and HederaverifiedMay 18, 2026
Ivy GeraniumnounMWEa commonly cultivated trailing South American plant with peltate leaves and rosy flowersverifiedMay 18, 2026
Ivy-Leaved GeraniumnounMWEa commonly cultivated trailing South American plant with peltate leaves and rosy flowersverifiedMay 18, 2026
Ixodidnounticks having a hard shield on the back and mouth parts that project from the headverifiedMay 18, 2026
Izarnouna voluminous cotton outer garment (usually white) traditionally worn by Muslim women of northern Africa and the Middle EastverifiedMay 18, 2026
Izzardnounthe 26th letter of the Roman alphabetverifiedMay 18, 2026