switchingThe controlling or routing of signals in circuits to execute logical or arithmetic operations or to transmit data between specific points in a network.
switching centerIn communications systems, a facility in which switches are used to interconnect communications circuits on a circuit-, message-, or packet-switching…
SWODY1The Day-1 Convective Outlook, sometimes called the "AC" is a guidance product issued by the Operational Guidance Branch (OGB) unit of the Storm Prediction…
SWODY2The Day 2 Convective Outlook is very similar to the Day 1 Outlook. It is issued only twice a day, at 08Z and 18Z, and covers the period from 12Z the…
SWOT analysisA summary of a company’s strengths and weaknesses, and the environmental opportunities and threats that will most influence it.
SWPOn a buoy report, Swell Period is the time (usually measured in seconds) that it takes successive swell wave crests or troughs pass a fixed point.
SWSA rare, congenital disorder that affects the brain, skin, and eyes. Abnormal blood vessel growth occurs in the trigeminal nerve in the face and the…
syllabary[A] list of individual letters, combination of letters, or syllables, with their equivalent code groups, used for spelling out words or proper names not…
syllableA character string or a bit string in a word.
symbiontAn organism living in symbiosis with another, dissimilar organism.
SymbiosisThe close association of two or more dissimilar organisms where both receive an advantage from the association. See Commensalism, Parasitism.
symbolA graphic pattern used to represent a feature. For example, line symbols represent arc features; marker symbols, points; shades symbols, polygons; and…
symbol environmentDefines the types of map symbols and their characteristics during a graphic display session in ARC/INFO.
symbol tableWhere a "compiler" remembers symbols. A program like Perl must somehow remember all the names of all the variables, filehandles, and subroutines you've…
symbolic debuggerA program that lets you step through the execution of your program, stopping or printing things out here and there to see whether anything has gone wrong…
symbolic languageA computer programming language used to express addresses and instructions with symbols convenient to humans rather than to machines.
symbolic linkAn alternate filename that points to the real "filename", which in turn points to the real "file".
symbolic logicThe discipline in which valid arguments and operations are dealt with using an artificial language designed to avoid the ambiguities and logical…
symbolic referenceA variable whose value is the name of another variable or subroutine. By dereferencing the first variable, you can get at the second one.
SymCLIThe Symmetrix command line interface used to configure and manage EMC Symmetrix disk arrays.
symlinkA file system object that can be used to redirect a path transparently to another part of the file system. Also known as "symbolic link" or "soft link."
symmetric authentication methodMethod for demonstrating knowledge of a secret, in which both entities share a common authentication information [10181-2].
symmetric cryptographyCryptography in which the same key is used for encryption and decryption. [2382-pt.8]
Symmetric Double EyeA concentrated ring of convection that develops outside the eye wall in symmetric, mature hurricanes.
symmetric encryptionA common key and mathematical algorithm used to both encrypt and decrypt a message.
Symmetric KeyA cryptographic key that is used to perform both the cryptographic operation and its inverse, for example to encrypt and decrypt, or create a message…
symmetric propertyIf a property P is symmetric, and the property relates individual a to individual b then individual b is also related to individual a via property P.
symmetrical channelA channel in which the send and receive circuits have the same data signaling rate.
symmetrical pairA balanced transmission line, in a multipair cable, having equal conductor resistances per unit length, equal impedances from each conductor to earth, and…
symmetryThe attribute describing the relationship of information flow between two (or more) access points or reference points involved in a communication.
sympathetic nervous system(SIM-puh-THEH-tik NER-vus SISS-tum) The part of the nervous system that increases heart rate, blood pressure, breathing rate, and pupil size.
sympatric speciationThe evolution of new species by population s that inhabit the same or overlapping geographic regions.
sympodialA type of plant development in which the terminal bud of the stem stops growing due either to its abortion, or to its differentiation into a floral…
SymptomA sign or indication that a person has a condition or disease. Some examples of symptoms are headache, fever, fatigue, nausea, vomiting, and pain.
symptom managementCare given to improve the quality of life of patients who have a serious or life-threatening disease.
symptomaticHaving to do with symptoms, which are signs of a condition or disease.
SynapsisThe pairing of homologous chromosome pairs during prophase of the first meiotic division, when crossing over occurs.
synaptonemal complex(Abbreviation: SC). A ribbon-like protein aceous structure formed between paired homologous chromosome s at the end of the first meiotic prophase.
synchronismThe state of being synchronous. 2. For repetitive events with the same, multiple, or submultiple repetition rates, a relationship among the events such…
SynchronizationFor data streams, the process whereby a received set of data is placed in one to one correspondence with the data assumed to have been transmitted.
synchronization bitA bit used to achieve or maintain synchronism. Note: The term "synchronization bit" is usually applied to digital data streams, whereas the term…
synchronization codeIn digital systems, a sequence of bits introduced into a transmitted signal to achieve or maintain synchronism.
synchronization pulseA pulse used to achieve or maintain synchronism. Note: The term "synchronization pulse" is usually applied to analog signals, whereas the term…
synchronizedA keyword in the Java programming language that, when applied to a method or code block, guarantees that at most one thread at a time executes that code.
synchronized statementA statement in which an object-lock must be obtained for the target object before the body of the statement can be entered.
synchronizingAchieving and maintaining synchronism. 2. In facsimile, achieving and maintaining predetermined speed relations between the scanning spot and the…
synchronizing pilotIn FDM, a reference frequency used for achieving and maintaining syntonization of the oscillators of a carrier system or for comparing the frequencies or…
synchronizing signalIn facsimile systems, the signal that maintains predetermined speed relations between the scanning spot and recording spot within each facsimile scanning…
synchronousProgramming in which the orderly sequence of events can be determined; that is, when things happen one after the other, not at the same time.
Synchronous condensersA synchronous machine running without mechanical load and supplying or absorbing reactive power.
synchronous crypto-operation[A] method of on-line crypto-operation in which crypto-equipment and associated terminals have timing systems to keep them in step. [INFOSEC-99]
synchronous cultureA culture in which the cell cycle is synchronized for the majority of the cells present.
synchronous data networkA data network in which synchronism is achieved and maintained between data circuit-terminating equipment (DCE) and the data switching exchange (DSE), and…
synchronous data replicationEach data replication I/O waits for the preceding I/O to complete before beginning another replication.
Synchronous DetectionRadar processing that retains the received signal amplitude and phase but that removes the intermediate frequency carrier.
Synchronous GeneratorAn electrical generator that runs at a constant speed and draws its excitation from a power source external or independent of the load or transmission…
synchronous idle character (SYN)A transmission control character used in synchronous transmission systems to provide a signal from which synchronism or synchronous correction may be…
Synchronous InverterAn electrical inverter that inverts direct current electricity to alternating current electricity, and that uses another alternating current source, such…
Synchronous MotorA type of motor designed to operate precisely at the synchronous speed with no slip in the full-load speeds (rpm).
synchronous networkA network in which clocks are controlled to run, ideally, at identical rates, or at the same mean rate with a fixed relative phase displacement, within a…
synchronous orbitAny orbit in which an orbiting object has a period equal to the average rotational period of the body being orbited, and in the same direction of rotation…
synchronous payloadsPayloads derivable from a network transmission signal by removing integral numbers of bits in every frame, i.e.
Synchronous ReplicationIn synchronous replication, each write to the primary disk and the secondary (remote) disk must be complete before the next write can begin.
synchronous systemA system in which events, such as signals, occur in synchronism. Note 1: An example of a synchronous system is one in which a transmitter and receiver…
synchronous tandem encodingA transcoding of the form ADPCM-PCM-ADPCM (adaptive differential pulse code modulation-pulse code modulation-adaptive differential pulse code modulation)…
synchronous TDMA multiplexing scheme in which timing is obtained from a clock that controls both the multiplexer and the channel source.
Synchronous Test Line (103)The term "Synchronous Test Line" denotes an arrangement in an end office which performs marginal operational tests of supervisory and ring-tripping…
synchronous transfer modeIn a Broadband Integrated Services Digital Network (B-ISDN), a proposed transport level technique in which time-division multiplexing and switching is to…
synchronous transmissionDigital transmission in which the time interval between any two similar significant instants in the overall bit stream is always an integral number of…
synchronous transport signal level 1 (STS-1)The basic logical building block signal of synchronous optical networks (SONET). The STS-1 signal has a bit rate of 51.840 Mb/s. [T1.X1] [After T1.
SynclineA fold in rocks in which the strata dip inward from both sides toward the axis. Troughlike downward sag or fold in rock layers. Opposite of an anticline.
SyncopeA brief loss of consciousness from a transient deficiency in the oxygen carrying material of the blood to the brain.
SyncytiotrophoblastA multinucleated cell formed from the cells of the trophoblast. Only a small area of the syncytiotrophoblast is evident at the start of the formation of…
syncytiumA large cell-like structure formed by the joining together of two or more cells. The plural is syncytia.
SyndicateWhen a group of investment banks works together to underwrite and distribute a new security issue, they are acting as a syndicate.