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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
Apparent HorizonnounMWEthe line at which the sky and Earth appear to meetverifiedMay 18, 2026
Apparent MotionnounMWEan optical illusion of motion produced by viewing a rapid succession of still pictures of a moving objectverifiedMay 18, 2026
Apparent MovementnounMWEan optical illusion of motion produced by viewing a rapid succession of still pictures of a moving objectverifiedMay 18, 2026
Apparentnessnounthe property of being apparentverifiedMay 18, 2026
Apparitionnounan act of appearing or becoming visible unexpectedlyverifiedMay 15, 2026
Appeal BoardnounMWEa board of officials that are not judicial but are appointed to hear appealsverifiedMay 18, 2026
Appealingnessnounattractiveness that interests or pleases or stimulatesverifiedMay 18, 2026
Appeals BoardnounMWEa board of officials that are not judicial but are appointed to hear appealsverifiedMay 18, 2026
Appeals CourtnounMWEa court whose jurisdiction is to review decisions of lower courts or agenciesverifiedMay 18, 2026
Appearancenounpretending that something is the case in order to make a good impressionverifiedMay 18, 2026
Appearingnounformal attendance (in court or at a hearing) of a party in an actionverifiedMay 18, 2026
Appeasementnounthe act of appeasing (as by acceding to the demands of)verifiedMay 18, 2026
Appeasernounsomeone who tries to bring peace by acceding to demandsverifiedMay 18, 2026
Appellate CourtnounMWEa court whose jurisdiction is to review decisions of lower courts or agenciesverifiedMay 18, 2026
Appellationnounidentifying word or words by which someone or something is called and classified or distinguished from othersverifiedMay 18, 2026
Appendagenouna natural prolongation or projection from a part of an organism either animal or plantverifiedMay 18, 2026
Appendectomynounsurgical removal of the vermiform appendixverifiedMay 18, 2026
Appendicectomynounsurgical removal of the vermiform appendixverifiedMay 18, 2026
Appendicitisnouninflammation of the vermiform appendixverifiedMay 18, 2026
Appendiclenouna small appendageverifiedMay 18, 2026
Appendicular ArterynounMWEthe branch of the ileocolic artery that supplies the vermiform appendixverifiedMay 18, 2026
Appendicular SkeletonnounMWEthe part of the skeleton that includes the pectoral girdle and the pelvic girdle and the upper and lower limbsverifiedMay 18, 2026
Appendicular VeinnounMWEa vein that accompanies the appendicular artery and empties into the ileocolic veinverifiedMay 18, 2026
Appendicularianounfree-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicatesverifiedMay 18, 2026
Appendixnouna vestigial process that extends from the lower end of the cecum and that resembles a small pouchverifiedMay 18, 2026
Apperceptionnounthe process whereby perceived qualities of an object are related to past experienceverifiedMay 18, 2026
Appetencenouna feeling of craving somethingverifiedMay 18, 2026
Appetencynouna feeling of craving somethingverifiedMay 18, 2026
Appetisernounfood or drink to stimulate the appetite (usually served before a meal or as the first course)verifiedMay 18, 2026
Appetisingnessnounthe property of stimulating the appetiteverifiedMay 18, 2026
Appetitenouna feeling of craving somethingverifiedMay 18, 2026
Appetite SuppressantnounMWEa drug that suppresses appetiteverifiedMay 18, 2026
Appetizernounfood or drink to stimulate the appetite (usually served before a meal or as the first course)verifiedMay 18, 2026
Appetizingnessnounthe property of stimulating the appetiteverifiedMay 18, 2026
Applaudernounsomeone who applaudsverifiedMay 18, 2026
Applausenouna demonstration of approval by clapping the hands togetherverifiedMay 18, 2026
Applenounnative Eurasian tree widely cultivated in many varieties for its firm rounded edible fruitsverifiedMay 18, 2026
Apple AphidnounMWEbright green aphidverifiedMay 18, 2026
Apple BlightnounMWEa disease of apple treesverifiedMay 18, 2026
Apple ButternounMWEthick dark spicy puree of applesverifiedMay 18, 2026
Apple CankernounMWEa disease of apple treesverifiedMay 18, 2026
Apple DumplingnounMWEapples wrapped in pastry and bakedverifiedMay 18, 2026
Apple FritternounMWEfritter containing sliced appleverifiedMay 18, 2026
Apple GeraniumnounMWEgeranium with round fragrant leaves and small white flowersverifiedMay 18, 2026
Apple JellynounMWEjelly made from apple juiceverifiedMay 18, 2026
Apple JuicenounMWEthe juice of applesverifiedMay 18, 2026
Apple MaggotnounMWElarvae bore into and feed on applesverifiedMay 18, 2026
Apple MintnounMWEmint with apple-scented stems of southern and western EuropeverifiedMay 18, 2026
Apple NutnounMWEnutlike seed of a South American palmverifiedMay 18, 2026
Apple of DiscordnounMWE(classical mythology) a golden apple thrown into a banquet of the gods by Eris (goddess of discord--who had not been invited)verifiedMay 18, 2026
Apple of PerunounMWEintensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruitsverifiedMay 18, 2026
Apple OrchardnounMWEa grove of apple treesverifiedMay 18, 2026
Apple PolishernounMWEsomeone who humbles himself as a sign of respectverifiedMay 18, 2026
Apple RustnounMWErust fungus causing rust spots on apples and pears etcverifiedMay 18, 2026
Apple TartnounMWEa small open pie filled with sliced apples and sugarverifiedMay 18, 2026
Apple TreenounMWEany tree of the genus Malus especially those bearing firm rounded edible fruitsverifiedMay 18, 2026
Applecartnouna handcart from which apples and other fruit are sold in the streetverifiedMay 18, 2026
Applejacknoundistilled from hard ciderverifiedMay 18, 2026
Applesaucenounpuree of stewed apples usually sweetened and spicedverifiedMay 18, 2026
Applesauce CakenounMWEmoist spicy cake containing applesauceverifiedMay 18, 2026
AppletnounJava programs; an application program that uses the client's web browser to provide a user interface.SystemMay 9, 2026
Applewoodnounwood of any of various apple trees of the genus MalusverifiedMay 18, 2026
Appliancenouna device or control that is very useful for a particular jobverifiedMay 18, 2026
applicabilitynounThe degree to which something is applicable or relevant.MetricMay 12, 2026
applicable requirementnounMWEThe relevant or appropriate necessary condition or conditions.RequirementRegulatedAug 30, 2026
ApplicantnounThe subscriber is sometimes called an “applicant” after applying to a certification authority for a certificate, but before the certificate issuance procedure is completed.IdentityMay 12, 2026
applicationnounSoftware program that performs a specific function directly for a user and can be executed without access to system control, monitoring, or administrative privileges.SystemMay 9, 2026
application controlnounMWEControls related to transactions and data within application systems. Application controls ensure the completeness and accuracy of the records and the validity of the entries made resulting from both programmed processing and manual data entry. Examples of application controls include data input validation, agreement of batch totals and encryption of data transmitted.ControlRegulatedAug 30, 2026
application developmentnounMWEThe process of designing and building code to create a computer program (software) used for a particular type of job.ProcessMay 9, 2026
application domainnounMWEA grouping or bounded environment defined by the scope of a particular software application or set of applications, within which resources, data, functions, and access controls are managed under a common operational context. It is distinguished from a physical system boundary or an organizational boundary in that the boundary is drawn around application-layer functionality rather than hardware, network perimeters, or administrative units. In security and compliance practice — as seen in access-control and separation-of-duties analysis — it is used to name one of several non-coextensive planes across which a single policy violation (such as a privilege conflict) may need to be traced, underscoring that controls cannot be assessed in isolation within one system alone. Because violations such as separation-of-duty failures can span systems and application domains, organizations must consider the entirety of their systems and system components when developing such policies. The NIST CSRC glossary reinforces the compositional reading: "domain separation" is defined as "a partitioning of the inputs to different application domains so that no input is assigned to more than one domain," trverifiedSep 1, 2026
Application FormnounMWEa form to use when making an applicationverifiedMay 18, 2026
Application layernounMWEIn the Open Systems Interconnection (OSI) communications model, the application layer provides services for an application program to ensure that effective communication with another application program in a network is possible. Scope Note: The application layer is not the application that is doing the communication; a service layer that provides these services.NetworkMay 9, 2026
Application ProgramnounMWEa program that gives a computer instructions that provide the user with tools to accomplish a taskverifiedMay 18, 2026
Application Programming Interface (api)nounMWEa software contract between the application and client, expressed as a collection of methods or functions. . . it defines the available functions you can execute; . . . the intermediary interface between the client and the application.SystemAug 28, 2026
Application systemnounMWEAn integrated set of computer programs designed to serve a well- defined function and having specific input, processing, and output activities (e.g., general ledger, manufacturing resource planning, human resource management).SystemMay 9, 2026
application whitelistingnounMWEApplication whitelisting is a computer administration practice used to prevent unauthorized programs from running. The purpose is primarily to protect computers and networks from harmful applications, and, to a lesser extent, to prevent unnecessary demand for resources. The whitelist is a simple list of applications that have been granted permission by the user or an administrator. When an application tries to execute, it is automatically checked against the list and, if found, allowed to run. An integrity check measure, such as hashing, is generally added to ensure that the application is in fact the authorized program and not a malicious or otherwise inappropriate one with the same name.ControlAug 30, 2026
Application-Oriented LanguagenounMWEa language whose statements resemble terminology of the userverifiedMay 18, 2026
Applications ProgrammenounMWEa program that gives a computer instructions that provide the user with tools to accomplish a taskverifiedMay 18, 2026
Applicatornouna device for applying a substanceverifiedMay 18, 2026
Applied AnatomynounMWEthe practical application of anatomical knowledge to diagnosis and treatmentverifiedMay 18, 2026
Applied MathnounMWEthe branches of mathematics that are involved in the study of the physical or biological or sociological worldverifiedMay 18, 2026
Applied MathematicsnounMWEthe branches of mathematics that are involved in the study of the physical or biological or sociological worldverifiedMay 18, 2026
Applied PsychologynounMWEany of several branches of psychology that seek to apply psychological principles to practical problems of education or industry or marketing etc.verifiedMay 18, 2026
Applied SciencenounMWEthe discipline dealing with the art or science of applying scientific knowledge to practical problemsverifiedMay 18, 2026
Applied ScientistnounMWEa person who uses scientific knowledge to solve practical problemsverifiedMay 18, 2026
Appliernouna person who requests or seeks something such as assistance or employment or admissionverifiedMay 18, 2026
applynounBring or put into operation or practical use.ProcessMay 9, 2026
Appoggiaturanounan embellishing note usually written in smaller sizeverifiedMay 18, 2026
Appointeenouna person who is appointed to a job or positionverifiedMay 18, 2026
Appointmentnounthe act of disposing of property by virtue of the power of appointmentverifiedMay 15, 2026
Appointment BooknounMWEa book containing a calendar and space to keep a record of appointmentsverifiedMay 18, 2026
Appointment CalendarnounMWEa book containing a calendar and space to keep a record of appointmentsverifiedMay 18, 2026
Apportioningnounthe act of distributing by allotting or apportioningverifiedMay 18, 2026
Apportionmentnounthe act of distributing by allotting or apportioningverifiedMay 18, 2026
Appositenessnounappropriateness for the occasionverifiedMay 18, 2026
Appositionnoun(biology) growth in the thickness of a cell wall by the deposit of successive layers of materialverifiedMay 18, 2026
Appraisalnounan expert estimation of the quality, quantity, and other characteristics of someone or somethingverifiedMay 18, 2026
Appraisernounone who determines authenticity or who guarantees validity of goods, such as art or propertyverifiedMay 18, 2026
Appreciationnoununderstanding of the nature or meaning or quality or magnitude of somethingverifiedMay 18, 2026
Appreciativenessnounwarm friendly feelings of gratitudeverifiedMay 18, 2026