Technology terms starting with A

1,579 terms

  1. anonymous user A non-validated user who is not recognized by the server, and who can access only published folders and address lists. [Exchange 2003]
  2. Anonymous user access The ability to gain access to a Web server on which one does not have an account.
  3. ANS The part of the nervous system that controls muscles of internal organs (such as the heart, blood vessels, lungs, stomach, and intestines) and glands…
  4. ANSI American National Standards Institute - a private, non-profit organization that administers and coordinates the U.S.
  5. ANSI (American National Standards Institute) A private, non-profit organization that administers and coordinates the U.S. voluntary standardization and conformity assessment system.
  6. ANSI/EIA/TIA-568 A U.S. industry standard that specifies a generic telecommunications cabling system, which will support a multiproduct, multivendor environment, for…
  7. answer back A signal sent by receiving equipment to the sending station to indicate that the receiver is ready to accept transmission.
  8. Answer File A file that automates Windows Setup. This file enables the configuration of Windows settings, the addition and removal of components, and many Windows…
  9. answer indicator A signal indicating acceptance of the call by the addressed user. [T1.507-1996]
  10. answer signal A supervisory signal returned from the called telephone to the originating switch when the call receiver answers.
  11. Answer/Disconnect Supervision The term "Answer/Disconnect Supervision" denotes the transmission of the switch trunk equipment supervisory signal (off-hook or on-hook) to the customer's…
  12. Ant Apache Open Source Java based build tool.
  13. antenna Any structure or device used to collect or radiate electromagnetic waves. 2. A device that converts radio frequency electrical energy to radiated…
  14. antenna aperture See aperture.
  15. Antenna Area The ratio of the power available at the terminals of an antenna to the incident power density of a plane wave from the direction polarized.
  16. antenna array An assembly of antenna elements with dimensions, spacing, and illumination sequence such that the fields for the individual elements combine to produce a…
  17. antenna blind cone The volume of space, usually approximately conical with its vertex at the antenna, that cannot be scanned by an antenna because of limitations of the…
  18. antenna coupler A device used to match the impedance of a transmitter and/or receiver to an antenna to provide maximum power transfer.
  19. antenna dissipative loss A power loss resulting from changes in the measurable impedance of a practical antenna from a value theoretically calculated for a perfect antenna.
  20. antenna effective area The functionally equivalent area from which an antenna directed toward the source of the received signal gathers or absorbs the energy of an incident…
  21. antenna efficiency The ratio of the total radiated power to the total input power. Note: The total radiated power is the total input power less antenna dissipative losses.
  22. antenna electrical beam tilt The shaping of the radiation pattern in the vertical plane of a transmitting antenna by electrical means so that maximum radiation occurs at an angle…
  23. ANTENNA GAIN The measure of effectiveness of a directional antenna as compared to an isotropic radiator, maximum value is called antenna gain by convention.
  24. antenna gain-to-noise-temperature (G/T) In the characterization of antenna performance, a figure of merit, where G is the antenna gain in decibels at the receive frequency, and T is the…
  25. antenna height above average terrain The antenna height above the average terrain elevations from 3.2 to 16 kilometers (2 to 10 miles) from the antenna for the eight directions spaced evenly…
  26. antenna lobe A three-dimensional section of the radiation pattern of a directional antenna, bounded by one or more cones of nulls or by regions of diminished…
  27. antenna matching The process of adjusting impedance so that the input impedance of an antenna equals or approximates the characteristic impedance of its transmission line…
  28. antenna noise temperature The temperature of a hypothetical resistor at the input of an ideal noise-free receiver that would generate the same output noise power per unit bandwidth…
  29. Anti-Ballistic Missile (ABM) The term used for Ballistic Missile Defense (BMD) weapons developed to negate the ballistic missile threat in the late 60s and early 70s.
  30. Anti-Ballistic Missile System A system designed to counter strategic ballistic missiles or their elements in flight.
  31. anti-clockwise polarized wave Synonym left-hand polarized wave.
  32. anti-hammering A type of software or hardware methods that increase the difficulty and cost of a key search attack on a PIN or password.
  33. anti-interference Pertaining to equipment, processes, or techniques used to reduce the effect of natural and man-made noise on radio communications.
  34. anti-jam Measures ensuring that intended transmitted information can be received despite deliberate jamming attempts. [INFOSEC-99]
  35. anti-node A point in a standing wave at which the amplitude is a maximum.
  36. Anti-phrasing Identifying word sequences in queries that do not contribute essentially to the query's meaning, such as "Where can I find" or "Where is".
  37. Anti-Radiation Missile (ARM) A missile that homes passively on a radiation source.
  38. Anti-Simulation The process of introducing random variations to the signature characteristics of an object in order to cause misidentification of the object by the…
  39. anti-spam stamping Functionality in Exchange Server 2007 that helps the messaging administrator diagnose spam-related problems by applying diagnostic metadata, or "stamps,"…
  40. anti-spoof Measures taken to prevent an unauthorized person/entity from impersonating an authorized person/entity to gain access to a data system. [DoJ] 2.
  41. anti-virus program A computer program designed to detect computer-file viruses and possibly to suggest or take corrective action. Synonym vaccine program. [After 2382-pt.8]
  42. Antiair Warfare Action required to destroy or reduce to an acceptable level the enemy air and missile threat.
  43. Antireflection Coating A thin coating of a material applied to a photovoltaic cell surface that reduces the light reflection and increases light transmission.
  44. Antisatellite Weapon (ASAT) A weapon designed to destroy satellites in space. The weapon may be launched from the ground, from an aircraft, or be based in space.
  45. Antivirus Software A program that monitors a computer or network to identify all major types of malware and prevent or contain malware incidents.
  46. antivirus stamping A mechanism that helps reduce the volume of antivirus scanning that is required across an organization by stamping messages that have been scanned for…
  47. anycall In adaptive high-frequency (HF) radio automatic link establishment, a broadcast in which (a) the called stations are unspecified, (b) stations receiving…
  48. AO area office.
  49. AOA At or above
  50. AOC Air Operations Center.
  51. AOCC Air Operations Control Center.
  52. AOEC Aero-Optic Evaluation Center, Buffalo, NY.
  53. AOI Active Optical Imager.
  54. AOL Popular web portal which merged with Time Warner.
  55. AOP annual operating plan.
  56. AOR Area of Responsibility.
  57. AOS OBSOLETE. Airborne Optical Sensor.
  58. AOSP Advanced On-Board Signal Processor.
  59. AOTF Acousto -Optic Tunable Filter.
  60. AP analysis plan.
  61. Apache Axis The SOAP engine implementation used within the Globus Toolkit. See the Apache Axis website for details.
  62. Apache Commons See http://jakarta.apache.org/commons/ for more details.
  63. APB Acquisition Program Baseline.
  64. APBI Advanced Planning Briefing to Industry (MDA).
  65. APC A cell that shows an antigen on its surface to other cells of the immune system. This is an important part of an immune response.
  66. APCC Alternate Processing and Correlation Center.
  67. APD On a buoy report, the average wave period (seconds) of all waves during the 20-minute period.
  68. APDP Acquisition Professional Development Program.
  69. aperiodic antenna An antenna designed to have an approximately constant input impedance over a wide range of frequencies.
  70. Aperture An opening; in solar collectors, the area through which solar radiation is admitted and directed to the absorber.
  71. aperture card An IBM punch card with a window which holds a 35mm frame of microfilm. Indexing information is punched in the card.
  72. aperture correction 1. In a scanned image system, electrical compensation for the distortion introduced by the limiting size of a scanning aperture. [IEEE 100; After SMPTE] 2.
  73. aperture distortion In facsimile, the distortion of the recorded image caused by the shape and finite size of the scanning and recording apertures.
  74. aperture illumination 1. The field distribution, in amplitude and phase, over the antenna physical aperture. 2.
  75. aperture-to-medium coupling loss The difference between the theoretical gain of a very large antenna, such as the antennas in beyond-the-horizon microwave links, and the gain that can be…
  76. APEX The portion of a root or shoot containing the primary or apical meristem.
  77. API Ascent-Phase Intercept.
  78. API (Application Program Interface) A language and message format used by an application program to communicate with the operating system or some other control program such as a database…
  79. API (Application Programming Interface) A set of functions that gives programmers access to another application's internal features from within their own application.
  80. APIPT Acquisition Planning IPT (PAC-3 term).
  81. APL An aggressive (fast-growing) type of acute myeloid leukemia in which there are too many immature blood-forming cells in the blood and bone marrow.
  82. APLE Average Power Laser Experiment.
  83. APM Advanced Penetration Model.
  84. APMA Acquisition Program Management Agreement.
  85. APO Arizona Projects Office.
  86. APOD Aerial Point of Debarkation.
  87. Apogee The farthest distance between the moon and earth or the earth and sun.
  88. apogee altitude See altitude of the apogee or of the perigee.
  89. APOP APOP stands for Authenticated Post Office Protocol. Every mail connection made sends your username and password across the network in clear text (no…
  90. app Abbreviation for application, application software.
  91. app compat The concept of ensuring that older applications still run correctly under newer operating systems.
  92. apparent power In alternating-current power transmission and distribution, the product of the rms voltage and amperage.
  93. AppCompat database A database that contains a list of applications that may have potential compatibility problems and remedies.
  94. append mode A file writing mode, in which the existing contents of a file are retained when the file is opened. New contents are appended to the existing.
  95. applet Applets are Java programs based around the Applet or JApplet classes. They are most closely associated with the ability to provide active content within…
  96. applet container A container that includes support for the applet programming model.
  97. Appliance A device for converting one form of energy or fuel into useful energy or work.
  98. ApplianceWatch A suite of products for enterprise system management that is formally certified by leading vendors of system management frameworks.
  99. Applicant inventor or joint inventors who are applying for a patent on their own invention, or the person mentioned in 37 CFR 1.42, 1.43 or 1.
  100. Application Under the Equal Credit Opportunity Act (ECOA), an oral or written request for an extension of credit that is made in accordance with the procedures…