national security information (NSI)Information that has been determined, pursuant to Executive Order 12958 or any predecessor order, to require protection against unauthorized disclosure.
national security systemAny telecommunications or information system operated by the United States Government, the function, operation, or use of which: (a) involves intelligence…
National Severe Storms LaboratoryThis is one of NOAA's internationally known Environmental Research Laboratories, leading the way in investigations of all aspects of severe weather.
national stage applicationan application which has entered the national phase of the Patent Cooperation Treaty by the fulfillment of certain requirements in a national Office…
National Strategy SelectionThe determination of when it is in the national interest to activate and employ defense resources (i.e.
National System of MPAsThe group of MPA sites, networks, and systems established and managed by federal, state, territorial, tribal, and/or local governments that collectively…
National Test Bed (NTB)A number of geographically separated simulation and test facilities that are linked through communications to simulate various portions of the ballistic…
National Test Facility (NTF)A large, modeling, simulation and test facility located on Falcon AFB in Colorado which serves as the central control, coordinating, and computing center…
National Transfer Format (NTF)British Standard BS 7567. NTF is an exchange format that permits the transfer of vector data with five different levels of complexity.
National Visa Center (NVC)A Department of State facility located in Portsmouth, New Hampshire. It supports the worldwide immigrant visa operations of the Bureau of Consular Affairs…
National Warning Center (NWC)Center in CMAFB, which activates the radio, TV, and sirens that warn the U.S. population of impending ballistic missile attack.
National Warning System (NAWAS)A dedicated, commercially leased, nationwide voice telephone warning system operated on a 24-hour basis, with a National Warning Center and an Alternate…
National Weather and Crop SummaryA product of the National Agricultural Statistics Service, Agricultural Statistics Board, and U.S. Department of Agriculture.
National Weather Service (NWS)The National Weather Service provides weather, hydrologic, and climate forecasts and warnings for the United States, its territories, adjacent waters and…
Nationwide Rivers Inventory (NRI)The Nationwide Rivers Inventory is a listing of more than 3,400 free-flowing river segments in the United States that are believed to possess one or more…
NativeA Java keyword that is used in method declarations to specify that the method is not implemented in the same Java source file, but rather in another…
Native AmericanOf, or relating to, a tribe, people, or culture that is indigenous to the United States. (See Native American Graves Protection and Repatriation Act)
Native American Tribal Insigniainsignia that various federally and state recognized Native American tribes have identified as their official tribal insignia -- see Native American…
Native EnvironmentThe original configuration (software, passwords, server configuration, etc.) of a backup tape or email system.
Native ExecutionExecution of an application directly on a physical server, as contrasted with running the application in a virtual machine.
Native FileA file in its original file format that has not been converted to a digital image or other file format
Native File FormatElectronic documents produced as originally maintained and used (e.g. Microsoft Word).
Native FormatElectronic documents have an associated file structure defined by the original creating application.
native ligninThe lignin as it exists in the lignocellulosic complex before separation.
Native loadWholesale and retail customers that the electric transmission provider is obligated to serve.
native methodA method written in a language other than Java, but accessible to a Java program.
native modeAn operating mode of Exchange Server 2003 when the Exchange organization consists of only Exchange 2003 or Exchange 2000 servers.
native mode usageA statement syntax entered in ARC/INFO in the language of an external system. Inclusion of an SQL WHERE clause in an ARC/INFO native mode SQL selection…
native proteinThe naturally occurring form of a protein.
Native SystemA computer running a single operating system, and in which the applications run directly in that operating system.
Natural ControlA stream gaging control which is natural to the stream channel, in contrast to an artificial control structure by man.
Natural CoolingSpace cooling achieved by shading, natural (unassisted, as opposed to forced) ventilation, conduction control, radiation, and evaporation; also called…
Natural DraftDraft that is caused by temperature differences in the air.
Natural drainagesNatural systems that convey water (such as a stream channel) that may be perennial, intermittent, or ephemeral.
Natural floodwayThe channel of a water course and those portions of the adjoining flood plain which are reasonably required to carry a selected probability flood.
natural frequencyOf an antenna, the lowest frequency at which the antenna resonates without the addition of any inductance or capacitance.
Natural frequency (f)The natural frequencies of a structure are the frequencies of free vibration. Free vibration is vibration that occurs in the absence of forced vibration.
Natural gasA hydrocarbon gas obtained from underground sources, often in association with petroleum and coal deposits.
Natural gas liquids (NGLs)Those hydrocarbons in natural gas that are separated as liquids from the gas. Includes natural gas plant liquids and lease condensate.
Natural Gas Steam Reforming ProductionA two step process where in the first step natural gas is exposed to a high-temperature steam to produce hydrogen, carbon monoxide, and carbon dioxide.
natural history studyA study that follows a group of people over time who have, or are at risk of developing, a specific medical condition or disease.
Natural killer cellA type of white blood cell that contains granules with enzymes that can kill tumor cells or microbial cells.
Natural Language ProcessingAlgorithms which attempt to understand the true intent of a search query rather than just matching results to keywords.
Natural Language Processing (NLP)Field of computer science concerned with the interactions between computers and human (natural) languages.
natural language queryA type of search that analyzes written expressions (such as "Who runs the finance department?") instead of a simple collection of keywords.
Natural Language SearchA manner of searching that permits the use of plain language without special connectors or precise terminology, such as Where can I find information on…
Natural period of vibration (T)The period of vibration of a a structure is the time required for one cycle of the simple harmonic motion in one of these characteristic patterns (shapes).
Natural Resources Damage (NRD)Natural Resources Damages (NRD) are defined as injury to, destruction of, or loss of natural resources, including land, fish, wildlife, biota, air, water…
Natural ScienceThe sciences involved in the study of the physical world and its phenomena.
Natural selectionThe differential survival and reproduc- tion of organisms with genetic characteristics that enable them to better utilize environmental resources.
Natural Space EnvironmentThe natural environment, which exists above the sensible atmosphere. Space begins approximately 100 km and above.
Natural VentilationVentilation that is created by the differences in the distribution of air pressures around a building.
NaturalizationProcess by which a person acquires nationality after birth and becomes entitled to privileges of citizenship in a country other than that in which such…
NaturalnessArea which generally appears to have been affected primarily by the forces of nature, with the imprint of man's work substantially unnoticeable.
Nature tourismTravel to unspoiled places to experience and enjoy nature.
NatureServeA nonprofit organization that provides the scientific information and tools needed to guide effective conservation action.
NatureServe ExplorerA Web site from NatureServe that provides authoritative conservation information in a searchable database for more than 70,000 plants, animals, and…
naturopathy(nay-chuh-RAH-puh-thee) A system of disease prevention and treatment that avoids drugs and surgery.
nauseaA feeling of sickness or discomfort in the stomach that may come with an urge to vomit. Nausea is a side effect of some types of cancer therapy.
Nautical DawnThe time at which the sun is 12 degrees below the horizon in the morning. Nautical dawn is defined as that time at which there is just enough sunlight for…
Nautical DuskThe time at which the sun is 12 degrees below the horizon in the evening. At this time, objects are no longer distinguishable.
Nautical MileA unit of distance used in marine navigation and marine forecasts. It is equal to 1.15 statue miles or 1852 meters.
nautical mile (nmi)A unit of distance used in navigation and based on the length of one minute of arc taken along a great circle.
Nautical TwilightThe time after civil twilight, when the brighter stars used for celestial navigation have appeared and the horizon may still be seen.
Naval Space Command (NAVSPACECOM)The naval component of USSPACECOM. Responsible for day-to-day operation of FLTSATCOM, NAVSPASUR, etc.
Naval Space Operations Center (NAVSPOC)Existing Navy component command center at Dahlgren, VA, responsible for logistical and administrative support of forces assigned to them.
Navigable watersWaters of the United States including: (a) All waters that are currently used, were used in the past, or may be susceptible to use in interstate or…
navigateTo move around (a) within a series of Web pages, or (b) among different Web pages, by following hyperlinked paths within each document.
NavigationInformation discovery through drill-down into query results. Navigation is possible both on document level attributes/entities and contextual entities…
Navigation bar (nav bar)a web site's navigation icons, usually arranged in a row down the left hand side or along the top that plays crucial roles in directing spiders to the…
Navigation MethodsThree basic methods of providing and managing inland waterways - 1) Run-of-the-River: no provision of upstream storage; 2) Slack-Water: locks and dams…
navigation paneThe pane that either displays icons for all views, folders, and agents in an application or displays the current navigator.
navigatorAn individual or organization that's trained and able to help consumers, small businesses, and their employees as they look for health coverage options…
NavigatorsNavigators deliver in-person outreach, education, and enrollment in both qualified health plans and public insurance options.
NAVMACSNavy Modular Automated Communications System (USN term).
NAVMICNaval Maritime Intelligence Center, Suitland, MD.
NAVSTARNavigational satellite, part of the Global Positioning System (GPS).
NAVTEXAn international automated medium frequency (518 kHz) direct-printing service for delivery of navigational and meteorological warnings and forecasts, as…
NAVTEX Forecast(NAV) - A National Weather Service marine forecast combining various Coastal Waters and Offshore forecasts, optimized to accommodate transmission via…