deferred enforcementA stage of deployment that allows a noncompliant computer full access to the network until a date and time after which network access becomes restricted.
Definable Reply-To AddressWhen you send an email and the recipient clicks "reply," normally the email address that the message was sent from will automatically be used.
defined1. Fixed conditions of medium, environment and protocol for growth. 2. Precisely known and stated elements of a tissue culture medium.
defined classA class that has at least one set of necessary and sucient conditions is known as a Defined Class; they have a definition, and any individual that…
definitionA declaration that reserves storage (for data) or provides implementation (for methods). See also declaration.
DeflectionUpstream or downstream movement of a dam or dike.
DEFSMACDefense Special Missiles and Astronautics Center, Ft. Meade, MD.
degaussTo remove a residual magnetic field from a magnetized object, usually by introducing much stronger and gradually diminishing magnetic fields of…
degaussing[A] procedure that reduces the magnetic flux to virtual zero by applying a reverse magnetizing field. Synonym demagnetizing. [INFOSEC-99]
DegradationProcess wherein the elevation of streambeds, sandbars, and flood plains is lowered by erosion. The opposite of aggradation.
degraded minute (DM)A 1-minute interval with a BER (bit error ratio) worse than 10:6. The 1-minute intervals are derived by removing severely errored seconds from the total…
degraded modeThe operating mode of a NetApp appliance when a disk in the RAID group has failed or the batteries on the NVRAM card are low.
degraded service stateThe condition that exists when one or more of the required service performance parameters fall outside predetermined limits, resulting in a lower quality…
degraded unit of timeA specified period of time during which bits are transferred from a source to a destination, where a bit error ratio worse than a specified threshold…
degree of coherenceA dimensionless unit, expressed as a ratio, used to indicate the extent of coherence of an electromagnetic wave such as a lightwave.
degree of isochronous distortionIn data transmission, the ratio of (a) the absolute value of the maximum measured difference between the actual and the theoretical intervals separating…
degree of start-stop distortionIn asynchronous data transmission, the ratio of (a) the absolute value of the maximum measured difference between the actual and theoretical intervals…
Degrees of FreedomA statistical measure of how unique biometric data is. Technically, it is the number of statistically independent features (parameters) contained in…
dehopTo modify a frequency-hopping signal so that it has a constant center frequency.
dejitterizerA device that reduces jitter in a digital signal. Note 1: A dejitterizer usually consists of an elastic buffer in which the signal is temporarily stored…
Del.icio.usPopular social bookmarking website. See also: Del.icio.us Del.icio.us Recently Popular
DelayA device used to obtain detonation of charges at separate times. An electric blasting cap which explodes at a set interval after current is passed through…
delay distortionIn a waveform consisting of two or more wave components at different frequencies, distortion caused by the difference in arrival times of the frequency…
delay encodingThe encoding of binary data to form a two-level signal such that (a) a "0" causes no change of signal level unless it is followed by another "0" in which…
delay equalizerA corrective network designed to make the phase delay or envelope delay of a circuit or system substantially constant over a desired frequency range.
delay lineA transmission line, or equivalent device, used to delay a signal. 2. A single-input-channel device, such as a single-input sequential logic element, in…
delay workingIn telephone switchboard operations, operation intended to ensure fair distribution of the time of one or more lines among groups of call originators.
delayed fan-outFunctionality on the Exchange Server 2007 Hub Transport server role where the server uses site link information to optimize the routing of messages that…
delayed-delivery facilityIn a communications network, a facility that stores data, destined for delivery to one or more addresses, for delivery at a later time.
delegateA person with permission to manage mail for another user, send mail for another user, or do both. [Exchange 5.5]
delegationAn assignment of administrative responsibility to a user, computer, group, or organization. [Exchange 2003]
delete markerAn object with a key and version ID, but without content. Amazon S3 inserts delete markers automatically into versioned buckets when an object is deleted.
deleted bitA bit not delivered to the intended destination.
deleted blockA block not delivered to the intended destination.
Deleted FileA file with disk space that has been designated as available for reuse. The deleted file remains intact until it has been overwritten with a new file.
deletion stubA truncated document that is left in a replica in place of the original document to indicate to the Replication task that the document should, in fact, be…
delimiterA "character" or "string" that sets bounds to an arbitrarily-sized textual object, not to be confused with a "separator" or "terminator".
DeliverableAn item produced or used during development of a system that is required to be made available to the evaluators for evaluation purposes.
delivered duplicated frameA frame D received by a particular destination user when both of the following conditions are true: D was not generated by the source user; D is exactly…
delivered errored frameA delivered frame when the value of one or more bits in the frame is in error, or when some, but not all, bits in the frame are lost bits or extra bits (i.
delivered out-of-sequence frameA delivered frame, Fi, that arrives at the destination user after any of the frames F(i+1), F(i+2), . . .
delivered overhead bitA bit that (a) is successfully transferred to a destination user, (b) performs its primary function within the telecommunications system, and (c) does not…
delivered overhead blockA block that (a) is successfully transferred to a destination user, (b) performs its primary function within the telecommunications system, and (c) does…
DeliveryThe amount of water delivered to the point of use. The difference between delivery and release is usually the same as consumptive use.
delivery confirmationInformation returned to the originator indicating that a given unit of information has been delivered to the intended addressee(s).
Delivery ErrorThe inaccuracy associated with a given weapon system resulting in a dispersion of shots about the aiming point. See also Circular Error Probable. 77
Delivery queueA queue that is used to hold messages that being delivered to a Mailbox server or remote location.
Dellinger effectAn effect--lasting from several minutes to several hours--that causes electromagnetic sky wave signals to disappear rapidly as a result of greatly…
delta frameIn digital television technology, a video frame created from the preceding key frame by modifying only those pixels that have changed.
delta modulation (DM)Analog-to-digital signal conversion in which (a) the analog signal is approximated with a series of segments, (b) each segment of the approximated signal…
Delta PointPart of a fingerprint pattern that looks similar to the Greek letter delta (Δ), as illustrated below.
delta-sigma modulationDelta modulation in which the integral of the input signal is encoded rather than the signal itself.
Delta-VA numerical index of the maneuverability of a satellite or rocket. It is the maximum change in velocity, which a spacecraft could achieve in the absence…
Dem/ValOBSOLETE. Demonstration and Validation (DD 5000 term).
DemandForm PCT/IPEA/401, filed with an International Preliminary Examining Authority, demanding that an international application shall be the subject of an…
demand assignmentAn operation in which several users share access to a communications channel on a real-time basis, i.e.
demand factorThe ratio of (a) the maximum real power consumed by a system to (b) the maximum real power that would be consumed if the entire load connected to the…
demand loadIn general, the total power required by a facility. Note: The demand load is the sum of the operational load (including any tactical load) and…
demand serviceIn ISDN applications, a telecommunications service that establishes an immediate communication path in response to a user request made through…
demarcation point (demarc)That point at which operational control or ownership of communications facilities changes from one organizational entity to another.
Demilitarized Zone (DMZ)A network created by connecting two firewalls. Systems that are externally accessible but need some protections are usually located on DMZ networks.
Demise AltitudeAltitude at which object of interest (decoy, chaff, etc.) no longer performs its desired function (matching RV characteristics, screening RV, etc.)
democratically synchronized networkA mutually synchronized network in which all clocks in the network are of equal status and exert equal amounts of control on the others, the network…
demodulationThe recovery, from a modulated carrier, of a signal having substantially the same characteristics as the original modulating signal.
DemographicRelated to the vital statistics of human populations (size, density, growth, distribution, etc.) and the effect of these on social and economic conditions.
DemographicsRelating to the statistical study of human populations.
Demonstration and Validation (Dem/Val)The acquisition phase when major program characteristics and product designs are refined through extensive study and analysis, hardware development, test…
demoteTo copy the property values found in a SharePoint Portal Server document profile to the properties of a Microsoft Office document.
Denial MeasureAn action to hinder or deny the enemy the use of space, personnel, or facilities.
denial of service1. The prevention of authorized access to resources or the delaying of time-critical operations. [2382-pt.8] 2.
Denial of Service (DoS)The prevention of authorized access to resources or the delaying of time-critical operations.
Denial-of-service attackFlooding the networks or servers of individuals or organizations with false data requests so they are unable to respond to requests from legitimate users.
denormalizationThe process of restructuring a normalized data model to accommodate operational constraints or system limitations.
dense binary codeA binary code in which all possible bit patterns that can be made from a fixed number of bits are used to encode user information but no overhead…
dense wavelength division multiplexing (DWDM)Multiplexing using close spectral spacing of individual optical carriers (wavelengths) to take advantage of desirable transmission characteristics (e.g.
densifyA process of adding vertices to an arc at specified distances, without altering the arc's shape. Compare with spline and grain tolerance.
DensityThe average number of people, families, or housing units on one unit of land. Density is also expressed as dwelling units per acre.
Denton, NickPublisher of Gawker, a popular ring of topical weblogs, which are typically focused on controversy. See also: Nick Denton.
Department of Defense Acquisition SystemA single uniform system whereby all equipment, facilities, and services are planned, designed, developed, acquired, maintained, and disposed of within the…
departmental security officerThe person responsible to the Permanent Head of a Government Department for establishing and enforcing Departmental Security policy; this includes the…
departmental storageA storage area for records in space less expensive than office space, such as a basement or warehouse.
departure angleThe angle between the axis of the main lobe of an antenna pattern and the horizontal plane at the transmitting antenna. Synonym takeoff angle.