Atmospheric LifetimeThe lifetime of a greenhouse gas refers to the approximate amount of time it would take for the anthropogenic increment to an atmospheric pollutant…
atmospheric moistureThe moisture content of the air as indicated by several measurements including relative humidity, specific humidity, dewpoint, vapor pressure, water vapor…
atmospheric noiseRadio noise caused by natural atmospheric processes, primarily lightning discharges in thunderstorms.
Atmospheric phenomenonAtmospheric phenomenon (phenomena) As commonly used in weather observing practice, an observable occurrence of particular physical significance within the…
Atmospheric PressureThe pressure of the air at sea level; one standard atmosphere at zero degrees centigrade is equal to 14.695 pounds per square inch (1.
Atmospheric RadiationInfrared radiation (energy in the wavelength interval of 3- 80 micrometer) emitted by or being propagated through the atmosphere.
atmospheric temperatureThe temperature indicated by a thermometer exposed to the air in a place sheltered from direct solar radiation.
atmospheric turbulenceHigh frequency velocity fluctuations that lead to turbulent transport of momentum, heat, mositure, and passive scalars, and often expressed in terms of…
atmospheric windowA region of the electromagnetic spectrum, from 8 to 12 micrometers, where the atmosphere is transparent to radiation.
ATMPOn a buoy report, the air temperature (Celsius).
ATN-161A substance being studied in the treatment of some types of cancer. ATN-161 may prevent the spread of tumor cells and the growth of new blood vessels from…
AtomA particle of matter indivisible by chemical means. It is the fundamental building block of elements.
atomicRefers to an operation that is never interrupted or left in an incomplete state under any circumstance.
Atomic numberThe number assigned to each element on the basis of the number of protons found in the element's nucleus.
atomic operationWhen Democritus gave the word "atom" to the indivisible bits of matter, he meant literally something that could not be cut: a- (not) + tomos (cuttable).
Atomic weightThe average weight (or mass) of all the isotopes of an element, as determined from the proportions in which they are present in a given element, compared…
Atomic weight (atomic mass)Approximately the sum of the number of protons and neutrons found in the nucleus of an atom.
AtomsThe smallest unit of matter that possesses chemical properties. All atoms have the same basic structure: a nucleus containing positively charged protons…
atorvastatin(uh-TOR-vuh-STA-tin) The active ingredient in a drug used to lower the amount of cholesterol in the blood and to prevent stroke, heart attack, and angina…
atorvastatin calcium(uh-TOR-vuh-STA-tin KAL-see-um) A drug used to lower the amount of cholesterol in the blood and to prevent stroke, heart attack, and angina (chest pain).
AtovaquoneA drug used against malaria. It is found in the combination atovaquone-proguanil which can be used for both prevention and treatment.
ATOWAcronym for acquisition and tracking orderwire. A downlink circuit that provides a terminal with information regarding uplink acquisition and…
ATPA substance present in all living cells that provides energy for many metabolic processes and is involved in making RNA.
ATP&FCAcquisition, Tracking, Pointing, and Fire Control.
ATP-aseAn enzyme that brings about the hydrolysis of adenosine triphosphate, by the cleavage of either one phosphate groups with the formation of ADP and…
ATRAA form of vitamin A that is made by the body, and can also be made in the laboratory.
atrasentanA substance that is being studied in the treatment of cancer. It belongs to the family of drugs called endothelin-1 protein receptor antagonists.
AtroposOne of the CPU schedulers provided by Xen. Atropos provides domains with absolute shares of the CPU, with timeliness guarantees and a mechanism for…
ATT/RHTAn aggressive cancer of the central nervous system, kidney, or liver that occurs in very young children.
attachTo store a file with a Lotus Notes document or form. The file, or attachment, is stored with the document or form in the application until one of them is…
AttachmentTaking a person's property to satisfy a courtordered debt.
attachment unit interface (AUI)In a local area network, the interface between the medium access unit (MAU) and the data terminal equipment within a data station.
AttachmentsAny file type associated with or attached to an e-mail.
attackAn attempt to violate computer security. Note: An example of an attack is malicious logic. [2382-pt.8] 2.
Attack Assessment (AA)An evaluation of information to determine the potential or actual nature and objectives of an attack for the purpose of providing information for timely…
Attack CharacterizationThe process by which the parameters of an attack in progress are developed, updated and defined.
Attack Operations (Counterforce)Attack operations prevent launch of theater missiles by attacking all elements of the overall enemy system, including such actions as destroying launch…
Attack PriceA concept used to evaluate the performance of a BMD system that defines price as the number of Re-entry Vehicles required to ensure target destruction.
Attack SignatureA specific sequence of events indicative of an unauthorized access attempt.
attack timeThe time between (a) the instant that a signal at the input of a device or circuit exceeds the activation threshold of the device or circuit and (b) the…
Attack Warning/ Attack Assessment (AW/AA)Integrated air, missile, and space defense data used to determine whether an attack is underway and, if so, what is the type and strength of the attack.
AttainmentAn area considered to have air quality as good as or better than the National Ambient Air Quality Standards for a given pollutant.
Attainment areaA geographic region where the concentration of a specific air pollutant does not exceed federal standards.
AttemptThe submission of a single set of biometric sample to a biometric system for identification or verification.
attendant access loopA switched circuit that provides an attendant with a manual means for call completion and control.
attendant conferenceA network-provided service feature that allows an attendant to establish a conference connection of three or more users.
attendant positionThe part of a switching system used by an attendant, i.e., an operator, to assist users in call completion and use of special services.
attention characterIn [a] trusted-computing-base (TCB) design, a character entered from a terminal that tells the TCB the user wants a secure communications path from the…
attention signalThe attention signal to be used by AM, FM, and TV broadcast stations to actuate muted receivers for inter-station receipt of emergency cuing announcements…
attenuatedWeakened or thinned. Attenuated strains of disease-causing bacteria and viruses are often used as vaccines.
attenuated vaccineA virulent organism that has been modified to produce a less virulent form, but nevertheless retains the ability to elicit antibodies against the virulent…
AttenuationA mechanism for controlling gene expression in prokaryotes that involves premature termination of transcription.
attenuation coefficientThe rate of diminution of average power with respect to distance along a transmission path.
attenuation constantThe real part of the propagation constant in any electromagnetic propagation medium.
attenuation distortionThe difference in loss at specified frequencies relative to the loss at 1004 Hz, unless otherwise specified. [NECA/FCC-5]
attenuation-limited operationThe condition that prevails when attenuation, rather than bandwidth, limits the performance of a communications link.
attenuatorA nucleotide sequence in the 5' region of a prokaryotic gene (or in its RNA ) that causes premature termination of transcription, possibly by forming a…
Atterberg limits (consistency limits)The boundaries (determined by laboratory tests) of moisture content in a soil between the liquid state and plastic state (known as liquid limit), between…
Attest/AttestationWhen you apply for health coverage through the Marketplace, you're required to agree (or "attest") to the truth of the information provided by signing the…
AttestationAttestation means the H-1B employer's agreement to the labor condition statements, which are specifically identified in Form ETA 9035 as well as set forth…
AtticThe usually unfinished space above a ceiling and below a roof.
Attic FanA fan mounted on an attic wall used to exhaust warm attic air to the outside.
Attic VentA passive or mechanical device used to ventilate an attic space, primarily to reduce heat buildup and moisture condensation.
AttorneyA person who has been qualified by a state or federal court to provide legal services, including appearing in court.
Attorney GeneralAttorney General means the chief official of the U.S. Department of Justice or the Attorney General's designee.
Attorney of RecordThe principal attorney in a lawsuit who signs all formal documents relating to the suit. In pro se cases, the party signs such documents.
Attorney-at-lawAn advocate, counsel or official agent employed in preparing, managing and trying cases in the courts.
Attorney-in-factA person (who is not necessarily a lawyer) authorized by another to act in his or her place, either for some particular purpose, as to do a specific act…
attorneys' fees awardIn exceptional cases in patent infringement litigation, the court may require the losing party to pay the attorneys' fees of the prevailing party.
attractantLiquid, solid or power form of scent applied to fishing lures for increased productivity.
AttractionAny visitor service or product which tourists would enjoy visiting or using. An attraction may not be an “attractor” but can still be an attraction.
attractivenessThe property or properties of a location that create an incentive for trips to be made to that location.
AttractorA significant tourist attraction, which compels visitation. The primary “must sees” in an area.
attributeAn attribute is a characteristic of data that sets it apart from other data, such as location, length, or type.
Attribute AuthorityAn entity, recognized by the Federal Public Key Infrastructure (PKI) Policy Authority or comparable Agency body as having the authority to verify the…
attribute certificateA set of attributes and a public key certificate identifier that are made unforgeable by use of the digital signature created with a private key.
attribute dataCharacteristic or descriptive information about a geographic feature (points, lines, or areas) stored in either tabular format or relational format.
Attribute surveySurvey to determine the important components of the recreational experience.
attribute table / DBMS tableAn INFO or other tabular file containing rows and columns. In ARC/INFO, attribute tables are associated with a class of geographic features, such as wells…
AttributesComponent describing object class properties.
Atypical(a-tip'ih-kul) irregular; not conformable to the type; an unusual type.
atypical hyperplasia(AY-TIP-ih-kul HY-per-PLAY-zhuh) A benign (noncancerous) condition in which cells look abnormal under a microscope and are increased in number.
atypical teratoid/rhabdoid tumor(AY-TIH-pih-kul TER-uh-toyd/RAB-doyd TOO-mer) An aggressive cancer of the central nervous system, kidney, or liver that occurs in very young children.
Auction marketAuction market trading, sometimes known as open outcry, is the way the major exchanges, such as the New York Stock Exchange (NYSE) and the Chicago…