step typeThe type of work done in a step. There are a limited number of step types, such as moving data from Amazon S3 to Amazon EC2 or from Amazon EC2 to Amazon…
step-by-step (SXS) switching systemAn automatic dial telephone system in which calls are switched by a succession of switches that move a step at a time, from stage to stage, each step…
step-index fiberAn optical fiber with a core having a uniform refractive index.
step-index profileFor an optical fiber, a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at…
stepwise refinementA divide and conquer approach to programming, in which a complex problem is recursively divided into smaller, more manageable, sub-problems.
SteradianThe unit of measure of solid angles equal to the angle subtended at the center of a sphere of unit radius by unit area on its surface.
steradian (sr)The metric unit of solid angle. See International System of Units.
stereophonic crosstalkAn undesired signal occurring in the main channel from modulation of the stereophonic channel or that occurring in the stereophonic channel from…
stereophonic sound subcarrierA subcarrier within the FM broadcast baseband used for transmitting signals for stereophonic sound reception of the main broadcast program service. [47CFR]
STFSAbbreviation for standard time and frequency signal. See standard time and frequency signal service.
Stick slipThe process in which (1) the tape sticks to the recording head because of high friction; (2) the tape tension builds because the tape is not moving at the…
sticky sessionA feature of the load balancer that binds a user's session to a specific application instance so that all requests coming from the user during the session…
Sticky shedThe gummy deposits left on tape path guides and heads after a sticky tape has been played.
Sticky tapeTape characterized by a soft, gummy, or tacky tape surface. Tape that has experienced a significant level of hydrolysis so that the magnetic coating is…
STILASScientific and Technical Information Library Automation System (USASSDC term).
still imageNonmoving visual information, i.e., fixed images, such as graphs, drawings, and pictures.
still videoVideo imagery that is not intended to convey the appearance of movement.
Stimulated EmissionPhysical process by which an excited molecule is induced by incident radiation to emit radiation at an identical frequency and in phase with the incident…
STINFO CenterScience and Technical Information data centers archiving and providing user access and support to a variety of missile defense test and evaluation data.
STLAbbreviation for standard telegraph level, studio-to-transmitter link.
stop impedanceThe time it takes for a stop transfer to occur. This is used to compute the impedance of a path or tour.
stop signalIn start-stop transmission, a signal at the end of a character that prepares the receiving device for the reception of a subsequent character.
stop transferThe number of things or packages transferred at a stop. This is used to find the total number of transfers on a path or tour.
Stop WordA word that is commonly used, such as the, an, or and, that is ignored by a search application.
stop word removalThe process of removing stop words from the query to ignore common words and return more relevant results.
Stop wordsWords which are very frequent and have little meaning. They are removed and not indexed.
stop-record signalIn facsimile systems, a signal used for stopping the process of converting the electrical signal to an image on the record medium.
stopbandA band of frequencies, between specified limits, that a circuit, such as a filter or telephone circuit, does not transmit.
StorageThe retention of water or delay of runoff either by planned operation, as in a reservoir, or by temporary filling of overflow areas, as in the progression…
Storage Area Network (SAN)A Storage Area Network (SAN) is a network of storage disks. In large enterprises, a SAN connects multiple servers to a centralized pool of disk storage.
Storage ArrayA subsystem which houses a group of disks (or tapes), together controlled by software usually housed within the subsystem.
storage cellAn addressable storage unit. 2. The smallest subdivision of storage into which a unit of data can be entered, stored, and retrieved.
Storage Consolidation"Storage Consolidation" is a method of centralizing data storageamong multiple servers. Also know as storage convergence.
Storage ControllerProviding such functionality as disk aggregation (RAID), I/O routing, and error detection and recovery, the controller provides the intelligence for the…
Storage directorA switch designed to link elements of a SAN or NAS across multiple sites. Storage directors are meant to act as a kind of switch of switches and are…
Storage ElementA physical grid component that is a storage component, such as a disk or array. See also: Grid Component
Storage GatewayA storage and content delivery service that connects an on-premise software applicance with cloud-based storage.
Storage groupA collection of Exchange databases on a server running Exchange 2000 that share the same Extensible Storage Engine (ESE) instance and transaction log.
Storage LimitMost free email providers have a limit to the amount of disk space your emails can take up on their computer. This is usually somewhere between ½MB-10MB.
Storage MediaAny removable device that stores data. See magnetic or optical storage media.
StoreThe generic name given to the storage subsystem on a server running Exchange. This term is used interchangeably to describe the Store.
store driverA software component of the Hub Transport Server that delivers inbound messages to Exchange stores, the databases that contain public folder and mailbox…
store overrideIn Exchange Server 2007, a mechanism used by the store driver to indicate an alternative delivery destination for messages being routed to public folders…
store-and-forward (S-F)Pertaining to communications systems in which messages are received at intermediate routing points and recorded i.e., stored, and then transmitted, i.e.
stored-program computerA computer that (a) is controlled by internally stored instructions, (b) can synthesize and store instructions, and (c) can subsequently execute those…
StormAny disturbed state of the atmosphere, especially affecting the Earth's surface, and strongly implying destructive and otherwise unpleasant weather.
Storm ShadowConventionally Armed Stand Off Missile weapon based on Matra of Frances Apache missile.
Strategic DefenseAll active and passive measures to detect, identify, assess, degrade and defeat ballistic missile, air, and space threats to North America, including…
Strategic Defense System (SDS)A generic descriptor, which refers to all architectural elements of the evolving ballistic missile defense system. 280
Strategic Level of WarThe level of war at which a nation or group of nations determines national or alliance security objectives and develops and uses national resources to…
Strategic Offensive Forces (SOF)Those forces under the command of the Commander in Chief, USSTRATCOM, the Commander in Chief, Atlantic Command, the Commander in Chief, Pacific Command…
Strategic ReserveThat quantity of material that is placed in a particular geographic location due to strategic considerations or in anticipation of major interruptions in…
Strategic WarningA warning prior to the initiation of a threatening act.
Strategic Warning Lead TimeThat time between the receipt of strategic warning and the beginning of hostilities.
Strategic Warning Post- Decision TimeThat time which begins after the decision, made at the highest levels of government(s) in response to strategic warning, is ordered executed and ends with…
stratumThe number of a clock (in a hierarchical synchronization distribution system) that defines the quality of the clock by specifying parameters such as…
stray currentElectrical current through a path other than the intended path.
Stream classClassification of streams based on the present and foreseeable uses made of the water, and the potential effects of on-site changes on downstream uses.
stream mode (MODE S)The only mode normally implemented for FTP is MODE S. This is simply sending each byte, one after another over the socket in order, with no application…
stream splittingThe process of delivering a unique stream to multiple clients simultaneously. Stream splitting reduces the number of requests sent across the network to…
streamingAmazon EMR: A utility that comes with Hadoop that enables you to develop MapReduce executables in languages other than Java.
streaming acceleratorA NetCache appliance configured to cache and split content from one or more streaming servers and provide that content to clients that request it.
streaming mediaaudio-visual content that is played as it is being downloaded. Thus, an Internet user could begin watching a video clip as the footage downloads rather…
streaming media cacheA NetCache appliance configured to proxy client requests for streaming media. Also known as "streaming media proxy."
streaming media presentationA general term used to describe the delivery of live or on-demand streaming media. A streaming media presentation can consist of multiple unique streams.
streaming serverA server configured to serve streaming media to clients.
streaming tape driveA magnetic tape unit capable of recording from, and dumping to, another storage medium without stopping at interblock gaps.
streaming tape recordingA method of recording on magnetic tape, which method maintains continuous tape motion without the requirement to start and stop within the interrecord gap.
street centerlineA real or imaginary line that is equidistant from the sides (usually pavement edges) of a travel path.