reference validation mechanism[The] Portion of a trusted computing base whose normal function is to control access between subjects and objects and whose correct operation is essential…
reference waveformThe artificially generated time history of an earthquake, derived from the histories of many actual earthquake accelerometers.
reference white level[In television,] The level corresponding to the specified maximum excursion of the luminance signal in the white direction. [47CFR]
referentWhatever a reference refers to, which may or may not have a name. Common types of referents include scalars, arrays, hashes, and subroutines.
referential integrityThe capability to ensure that changes to one table that affect other tables are transmitted to those other tables.
ReferralA written order from your primary care doctor for you to see a specialist or get certain medical services.
Referral FeesFees paid in exchange for delivering a qualified sales lead or purchase inquiry.
ReferrerThe URL of the web page from which a visitor came. The server's referrer log file will indicate this.
refileprocess of returning a record to its proper place
RefillMaterial which had previously been excavated as a result of construction activities and again placed to the lines as shown on the drawings.
RefinanceThe repayment of a debt from the proceeds of a new loan using the same property as security.
RefinancingA way of obtaining a better interest rate, lower monthly payments, or borrow cash on the equity in a property that has built up on a loan.
ReflectanceThe amount (percent) of light that is reflected by a surface relative to the amount that strikes it.
reflectionThe process whereby radiation (or other waves) incident upon a surface is directed back into the medium through which it traveled.
reflection coefficient (RC)The ratio of the amplitude of the reflected wave and the amplitude of the incident wave. 2.
reflection lossAt a discontinuity or impedance mismatch, e.g., in a transmission line, the ratio of the incident power to the reflected power.
reflective array antennaAn antenna, such as a billboard antenna, in which the driven elements are situated at a predetermined distance from a surface designed to reflect the…
Reflective CoatingsMaterials with various qualities that are applied to glass windows before installation.
Reflective GlassA window glass that has been coated with a reflective film and is useful in controlling solar heat gain during the summer.
Reflective Window FilmsA material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy.
ReflectivenessThe extent to which the demographics of the planning body's membership look like the demographics of the epidemic in the service area.
ReflectivityThe measure of the efficiency of a radar target in intercepting and returning Electro Magnetic Energy.
reflectivity (dBZ)A measure of the returned power, which is sensitive to the size and number of hydrometeors (i.e., the particle size spectra).
Reflectivity Cross SectionThis WSR-88D radar product displays a vertical cross section of reflectivity on a grid with heights up to 70,000 feet on the vertical axis and distance up…
Reflectivity FactorThe result of a mathematical equation (called the Weather Radar Equation) that converts the analog power (in Watts) received by the radar antenna into a…
ReflectorA component of a solar energy facility that reflects incident sunlight to a desired location or component within the facility, allowing it to be converted…
Reflector LampsA type of incandescent lamp with an interior coating of aluminum that reflects light to the front of the bulb.
refluxThe backward flow of liquid from the stomach into the esophagus.
ReforestationPlanting of forests on lands that have previously contained forests but that have been converted to some other use.
Reformulated gasoline (RFG)Gasoline that has altered composition or characteristics to reduce emissions of pollutants from vehicles in accordance with the Clean Air Act.
refracted rayA ray that undergoes a change of velocity, or in the general case, both velocity and direction, as a result of interaction with the material medium in…
RefractionThe change in direction of a ray of light when it passes through one media to another with differing optical densities.
Refractive IndexA measure of the amount of refraction. Numerically equal to the ratio of wave velocity in a vacuum to a wave speed in the medium, i.e.
refractive index (η, n)Of a medium, the ratio of the velocity of propagation of an electromagnetic wave in vacuum to its velocity in the medium. Synonym index of refraction.
refractive index contrastIn an optical fiber, a measure of the relative difference in refractive index of the core and cladding.
refractive index profileOf the cross section of an optical fiber, the description, i.e., plot, of the value of the refractive index as a function of distance from the fiber axis…
RefractivityExpressed as N; N = (n-1)*106, where n is refractive index and N is a function of temperature, pressure and vapor pressure (in the atmosphere).
refractoryIn medicine, describes a disease or condition that does not respond to treatment.
refractory cancerCancer that does not respond to treatment. The cancer may be resistant at the beginning of treatment or it may become resistant during treatment.
Refractory LiningA lining, usually of ceramic, capable of resisting and maintaining high temperatures.
reframing timeThe time interval between the instant at which a valid frame-alignment signal is available at the receiving data terminal equipment and the instant at…
refreshTo reproduce, repeatedly, a display image on a display surface, so that the image remains visible.
refresh packetsSignaling packets that are transmitted on a periodic basis across a permanent virtual circuit in the direction of transmission from the channelized side…
Refresh RateThe number of times per second a display (such as on a CRT or TV) is updated.
Refresh TagSee the paragraph about HTTP_EQUIV under Meta Tag.
RefreshingThis term can refer to periodic retensioning of tape, or the rerecording of recorded information onto the same tape (or different tape) to refresh the…
RefrigerantThe compound (working fluid) used in air conditioners, heat pumps, and refrigerators to transfer heat into or out of an interior space.
RefrigerationThe process of the absorption of heat from one location and its transfer to another for rejection or recuperation.
Refrigeration CapacityA measure of the effective cooling capacity of a refrigerator, expressed in Btu per hour or in tons, where one (1) ton of capacity is equal to the heat…
Refrigeration CycleThe complete cycle of stages (evaporation and condensation) of refrigeration or of the refrigerant.
Refuge compatibility requirementsRequirements under the Refuge Administration Act that all uses of a national wildlife refuge must be compatible with the purpose for which the refuge was…
RefugeeA person who has a well-founded fear of persecution if he/she should return to his/her home country.
refugium(pl.: refugia) An area set aside to provide protection/escape from ecological consequences occurring elsewhere.
RefundAn amount paid back because of an overpayment or because of the return of an item previously sold.
refundable creditWhen the amount of a credit is greater than the tax owed, taxpayers can receive a "refund" for some of the unused credit.
Refuse-Derived Fuel (RDF)A solid fuel produced by shredding municipal solid waste (MSW). Noncombustible materials such as glass and metals are generally removed prior to making…
RegenRegenerate. To obtain HP and mana back via food and drink.
Regenecare(reh-JEH-neh-KAYR) A substance being studied in the treatment of certain types of skin rash and skin pain in cancer patients.
regenerationIn biology, regrowth of damaged or destroyed tissue or body part.
Regeneration harvestA timber harvest method that removes selected trees in the existing stand to a density that allows for the establishment of a new even-aged stand below.
Regeneration with reservesSimilar to a regeneration harvest, except that a number of green trees are left standing to meet other resource needs such as wildlife habitat.
Regenerative BrakingA feature of hybrid and plug-in electric vehicles that captures energy normally lost during braking by using the electric motor as a generator and storing…
Regenerative CoolingA type of cooling system that uses a charging and discharging cycle with a thermal or latent heat storage subsystem.
regenerative feedbackFeedback in which the portion of the output signal that is returned to the input has a component that is in phase with the input signal.
Regenerative HeatingThe process of using heat that is rejected in one part of a cycle for another function or in another part of the cycle.
Regenerative medicineMedical interventions that aim to repair damaged organs, most often by using stem cells to replace cells and tissues damaged by aging and by disease.
regenerative repeaterA repeater, designed for digital transmission, in which digital signals are amplified, reshaped, retimed, and retransmitted. Synonym regenerator.
regeneratorSynonym regenerative repeater. 2. A device that reconstructs and retransmits a received pulse train. [T1.403-1989]
regimenA treatment plan that specifies the dosage, the schedule, and the duration of treatment.
regionA coverage feature class used to represent a spatial feature as one or more polygons. Many regions can be defined in a single coverage.
Region (of an image)An area of an image file that is selected for specialized processing. Also called a zone.
Region of Influence (ROI)Area occupied by affected resources and the distances at which impacts associated with license renewal may occur.
Region or RegionalAn area inclusive of and determined by participating national system sites and systems that is based on common management interests, similar or linked…
regionalIn oncology, describes the body area right around a tumor.
Regional Bell Operating Company (RBOC)Historically, one of the seven holding companies formed by divestiture by the American Telephone and Telegraph Company of its local Bell System operating…
regional cancerRefers to cancer that has grown beyond the original (primary) tumor to nearby lymph nodes or organs and tissues.
regional chemotherapy(REE-juh-nul KEE-moh-THAYR-uh-pee) Treatment with anticancer drugs directed to a specific area of the body.
Regional Defense System (RDS)That portion of the SDS that provides defense for a specific geographic region, such as the European Theater.
regional disasterA disaster, such as an earthquake or hurricane, that affects a large region. Local, campus, and proximate metropolitan clusters are less likely to protect…
regional enteritis(REE-juh-nul EN-teh-RY-tis) Chronic inflammation of the gastrointestinal tract, most commonly the small intestine and colon.
Regional exchangeStock exchanges in cities other than New York are called regional exchanges. They list both regional stocks, which may or may not be listed on the New…
Regional HazeHaze that is mixed uniformly between the surface and the top of a convective boundary layer.
regional lymph nodeIn oncology, a lymph node that drains lymph from the region around a tumor.
regional lymph node dissectionA surgical procedure to remove some of the lymph nodes that drain lymph from the area around a tumor.
Regional officeFive Reclamation offices in the 17 Western States that supervise area, field, and project offices in their respective geographic locations.
Regional Operations Center (ROC)A group of fixed and/or mobile centers with OPCON over allocated ground based sensors and weapons. 246
Regional Response Team (RRT)Regional planning and coordination of preparedness and response actions are accomplished through the RRT.
Regional Transmission Group (RTG)A voluntary organization of transmission owners, transmission users, and other entities interested in coordinating transmission planning, expansion…
Regional Transmission Organization (RTO)A voluntary organization of electric transmission owners, transmission users and other entities approved by the Commission to efficiently coordinate…
Regions - US East, US West, GovCloudAmazon’s way of classifying multiple geographic areas hosting EC2 world-wide. Each AWS Region is a separate geographic area.