automatic gain control (AGC)A process or means by which gain is automatically adjusted in a specified manner as a function of a specified parameter, such as received signal level.
automatic identified outward dialing (AIOD)A service feature of some switching or terminal devices that provides the user with an itemized statement of usage on directly dialed calls.
automatic link establishment (ALE)In high-frequency (HF) radio, the capability of a station to make contact, or initiate a circuit, between itself and another specified radio station…
automatic link transferAutomatic rerouting of the radio portion of a call for signal quality, traffic management, or other reasons. [T1.702-1995]
automatic message exchange (AME)In an adaptive high-frequency (HF) radio network, an automated process allowing the transfer of a message from message injection to addressee reception…
automatic message processing system (AMPS)Any organized assembly of resources and methods used to collect, process, and distribute messages largely by automatic means. [JP1]
automatic number identification (ANI)A service feature in which the directory number or equipment number of a calling station is automatically obtained.
automatic operationThe functioning of systems, equipment, or processes in a desired manner at the proper time under control of mechanical or electronic devices that operate…
automatic personal deregistrationThe process by which a user's location registration is automatically canceled without any explicit action from the user. [T1.Rpt34-1994]
automatic personal registrationThe process by which a user's location registration is automatically updated without any explicit action from the user. [T1.Rpt34-1994]
automatic redial: A service feature that allows the user to dial, by depressing a single key or a few keys, the most recent telephone number dialed at that instrument.
automatic remote rekeying[In INFOSEC, a] procedure to rekey a distant crypto-equipment electronically without specific actions by the receiving terminal operator.
automatic remote reprogramming and rekeyingThe procedure by which distant equipment is reprogrammed or rekeyed electronically without specific actions by the receiving terminal.
automatic ringdown circuitA circuit providing priority telephone service, typically for key personnel; the circuit is activated when the telephone handset is removed from the…
Automatic Scheduled TestingAutomatic Scheduled Testing (AST) of Switched Access Services (Feature Groups B, C and D), where the customer provides remote office test lines and 105…
automatic sequential connectionA service feature in which the terminals at each of a set of specified addresses are automatically connected, in a predetermined sequence, to a single…
automatic soundingThe testing of selected channels or paths by providing a very brief beacon-like identifying broadcast that may be used by other stations to evaluate…
automatic switching systemIn data communications, a switching system in which all the operations required to execute the three phases of information-transfer transactions are…
Automatic Voice Network (AUTOVON)Formerly, the principal long-haul, unsecure voice communications network within the Defense Communications System, now replaced by the Defense Switched…
AutomationThe replacement of manual operations by computerized methods. Automation can both improve efficiency and reduce errors brought on by manual intervention.
Autonomic1. Of, relating to, or controlled by the autonomic nervous system. 2. Acting or occurring involuntarily; automatic: an autonomic reflex.
Autonomic ComputingAn approach to self-managed computing systems with a minimum of human interference.
Autonomic Nervous System(AW-toh-NAH-mik NER-vus SIS-tem) The part of the nervous system that controls muscles of internal organs (such as the heart, blood vessels, lungs…
autonomous systemInternet (TCP/IP) terminology for a collection of gateways (routers) that fall under one administrative entity and that cooperate using a common interior…
autoregistrationA process by which external databases may be automatically added when the database type and path are supplied during connection.
Autoresponders (Mailbots)Automated programs which are established to return a prewritten message upon receipt of e-mail.
autosaveA feature that automatically saves files such as documents and chat transcripts.
AUTOSEVOCOMAcronym for Automatic Secure Voice Communications Network.
autosplitTo split a string automatically, as the -a "switch" does when running under -p or -n in order to emulate "awk".
autosupportMechanism that triggers e-mail messages from the customer site to Network Appliance Technical Support or another specified e-mail recipient when a problem…
Autounattend.xmlThe unattended answer file that is automatically detected by Windows Setup during operating system installation.
autovivificationA Greco-Roman word meaning "to bring oneself to life". In Perl, storage locations (lvalues) spontaneously generate themselves as needed, including the…
AUTOVONAcronym for Automatic Voice Network. Superseded by Defense Switched Network.
auxiliary AppCompat databaseAn additional database that is associated with the AppCompat database. The Auxiliary AppCompat database can be modified on the system and is used…
auxiliary operationAn offline operation performed by equipment not under control of the processing unit.
auxiliary powerElectric power that is provided by an alternate source and that serves as backup for the primary power source at the station main bus or prescribed…
auxiliary storageStorage that is available to a processor only through its input/output channels. 2. In a computer, any storage that is not internal memory, i.e.
AV (antivirus software)A computer program designed to detect and respond to malicious software, such as viruses and worms.
AvailabilityA reflection of the form and location of nutritional elements and their suitability for absorption.
Availability serviceThe Availability service improves information workers' free/busy data by providing secure, consistent, and up-to-date free/busy information to computers…
Availability ZoneA distinct location within a region that is insulated from failures in other Availability Zones, and provides inexpensive, low-latency network…
available lineIn voice, video, or data communications, a circuit between two points that is ready for service, but is in the idle state. 2.
Available NumbersAvailable numbers are numbers that are available for assignment to subscriber access lines, or their equivalents, within a switching entity or point of…
available stateA state where a (bidirectional or unidirectional) service is usable. Note: Each direction of a service is assumed to be in the available state unless a…
available timeFrom the point of view of a user, the time during which a functional unit can be used.
avalanche multiplicationA current-multiplying phenomenon that occurs in a semiconductor photodiode that is reverse-biased just below its breakdown voltage.
avalanche photodiode (APD)A photodiode that operates with a reverse-bias voltage that causes the primary photocurrent to undergo amplification by cumulative multiplication of…
average picture level (APL)In video systems, the average level of the picture signal during active scanning time integrated over a frame period; defined as a percentage of the range…
Average query response timeThe average time it takes for the search engine to respond to a given query. There are typically two times that can be measured: 1) the average response…
Average Unit Procurement Cost (AUPC)Design to average unit procurement cost objectives, expressed in constant dollars, are established for Milestone I, Concept Demonstration Approval.
AVHRRAdvanced Very High Resolution Radiometer. Main sensor on U.S. polar orbiting satellites.
AVI (.avi)Abbreviation for audio video interleaved. A file-name extension used to indicate a compressed video file in the AVI standard for a common operating system.
AVKAbbreviation for audio video kernel. Digital video interface (.dvi) software designed for playing motion video and audio across several different…
avoidance routingThe assignment of a circuit path to avoid certain critical or trouble-prone circuit nodes.
AVSSAbbreviation for audio-video support system. A digital video interface system software (for DOS) that plays motion video and audio. [After Silicon]
AWGThe abbreviation for American Wire Gauge; the standard for gauging the size of wires (electrical conductors).
AWGNAbbreviation for additive white gaussian noise. See white noise.
awkDescriptive editing term--short for "awkward". Also coincidentally refers to a venerable text-processing language from which Perl derived some of its…
AWS(1) AEGIS Weapons System (2) Advanced Warning System. (3) Arrow Weapons System (Joint US/Israeli BMD weapons system).
AWS (Amazon Web Services)AWS is short for Amazon Web Services. In addition to selling books and variety of other consumer products, Amazon also offers a variety of web services…
AWS CloudFormationA service for writing or changing templates that create and delete related AWS resources together as a unit. See Also http://aws.amazon.com/cloudformation.
AWS Consolidated BillingA billing option that lets you get a single bill for multiple AWS accounts. See Also http://aws.amazon.com/consolidated-billing.
AWS Identity and Access ManagementA web service that enables Amazon Web Services customers to manage users and user permissions within AWS. See Also http://aws.amazon.com/iam.
AWS Management ConsoleA graphical interface to manage compute, storage, and other cloud resources. See Also http://aws.amazon.com/console.
AWT (Abstract Windowing Toolkit)The Abstract Windowing Toolkit (AWT) provides a collection of classes that simplify the creation of applications with graphical user interfaces.
axial propagation constantIn an optical fiber, the propagation constant evaluated along the optical axis of the fiber in the direction of transmission.
axial ratioOf an electromagnetic wave having elliptical polarization, the ratio of the magnitudes of the major axis and the minor axis of the ellipse described by…
axial rayA light ray that travels along the optical axis.
Axis C++Open Source SOAP implementation used by C-Hosting. See http://ws.apache.org/axis/cpp for more details.
AzimuthA direction in terms of a 360° compass. North is at 0°, east is at 90°, south is at 180°, and west is at 270°.
Azimuth AngleThe direction or bearing toward which a sloping surface faces (e.g., a north-facing slope has an azimuth angle of 360°; a northeast-facing slope, an…
BAbbreviation used on long-term climate outlooks issued by CPC to indicate areas that are likely to be below normal for a given parameter (temperature…
B channelA communications channel used for the transmission of an aggregate signal generated by multichannel transmitting equipment. 2.
b frameAn MPEG video frame type that provides bidirectional interframe compression. Note: A b frame derives its content from the closest 1 or P frame, one in the…