21-letter words containing a, c, o, m
- accommodation address — an address on letters, etc, to a person or business that does not wish or is not able to receive post at a permanent or actual address
- accommodation officer — a person employed by an institution or organization, whose job it is to find accommodation for the people who attend that institution, esp for students at a university or college
- accounting management — (networking) The process of identifying individual and group access to various network resources to ensure proper access capabilities (bandwidth and security) or to properly charge the various individuals and departments. Accounting management is one of five categories of network management defined by ISO for management of OSI networks.
- adjusted gross income — (in U.S. income-tax returns) the total of an individual's wages, salaries, interest, dividends, etc., minus allowable deductions. Abbreviation: AGI.
- administrative county — a principal administrative division in Great Britain, usually not coextensive with traditional county boundaries.
- advanced photo system — a system that enables photographs in different formats to be taken on the same (small) roll of film
- aerodynamic stability — Aerodynamic stability is the way that a moving vehicle reacts to changes in air caused by passing vehicles.
- aerodynamic wave drag — the restraining force on a supersonic aircraft caused by shock waves.
- afro-american english — Black English (def 1).
- afro-american studies — black studies.
- afternoon performance — a performance during the afternoon, rather than the evening
- aids dementia complex — a brain disorder in people with AIDS that causes severe irreparable memory loss and disorientation, affecting the ability to function in social or work settings. Abbreviation: ADC.
- airborne command post — any of several converted commercial aircraft equipped with special communications and code gear, intended as flying bunkers for the president, secretary of defense, military commanders, or their designated replacements.
- algorithm description — (language) (ALDES) ["The Algorithm Description Language ALDES", R.G.K. Loos, SIGSAM Bull 14(1):15-39 (Jan 1976)].
- aluminum fluosilicate — a white, water-soluble powder, Al 2 (SiF 6) 3 , used in the manufacture of optical glass and of synthetic sapphires and rubies.
- america on-line, inc. — (company, communications) (AOL) A US on-line service provider based in Vienna, Virginia, USA. AOL claims to be the largest and fastest growing provider of on-line services in the world, with the most active subscriber base. AOL offers its three million subscribers electronic mail, interactive newspapers and magazines, conferencing, software libraries, computing support, and on-line classes. In October 1994 AOL made Internet FTP available to its members and in May 1995, full Internet access including web. AOL's main competitors are Prodigy and Compuserve.
- american saddle horse — one of a breed of horses, raised originally in the U.S., that have high-stepping gaits and are bred to the three-gaited or five-gaited type.
- ammonioferric oxalate — ferric ammonium oxalate.
- anatomy of melancholy — a philosophical treatise (1621) by Robert Burton.
- angular magnification — the ratio of the angle subtended at the eye by an image formed by an optical instrument to the angle subtended at the unaided eye by the object
- antiferromagnetically — In an antiferromagnetic manner.
- antihemophilic factor — a protein that is essential to normal blood clotting and is lacking or deficient in persons having hemophilia A. Abbreviation: AHF.
- apothecaries' measure — a system of liquid volume measure used in pharmacy in which 60 minims equal 1 fluid drachm, 8 fluid drachms equal 1 fluid ounce, and 20 fluid ounces equal 1 pint
- appalachian mountains — a mountain system of E North America, extending from Quebec province in Canada to central Alabama in the US: contains rich deposits of anthracite, bitumen, and iron ore. Highest peak: Mount Mitchell, 2038 m (6684 ft)
- arithmetic logic unit — the part of a central processing unit that performs arithmetic and logical operations
- arithmetic/logic unit — ALU.
- articles of agreement — a contract between the captain of a ship and a crew member regarding stipulations of a voyage, signed prior to and upon termination of a voyage.
- as a matter of course — If you do something as a matter of course, you do it as part of your normal work or way of life.
- as cool as a cucumber — If you say that someone is as cool as a cucumber, you are emphasizing that they are very calm and relaxed, especially when you would not expect them to be.
- astronomical distance — the distance from one celestial body to another, measured in astronomical units, light-years, or parsecs.
- astronomical latitude — the angle between the direction of gravity at the observer's position and the plane of the celestial equator
- astronomical triangle — the spherical triangle formed by the great circles connecting a celestial object, the zenith, and the celestial pole.
- astronomical twilight — the period of time during which the sun is 18° below the horizon
- atmospheric inversion — inversion (def 12).
- atmospheric-inversion — an act or instance of inverting.
- atomic disintegration — a process resulting in the change of a radioactive nucleus, either by emission of an alpha, beta, or gamma ray or by fission, and producing a change in the original mass, atomic number, or energy
- atomic unit of length — (in the Bohr atom) the radius of the electron orbit having the lowest energy.
- automatic hyphenation — (text) A feature of some word processors which can insert hyphens into words which would otherwise extend beyond the right hand margin of the page. More advanced word processors may have options to control the position of the hyphen, to restrict certain words from being hyphenated, and to allow custom dictionaries of hyphenation points to be built up.
- axial-flow compressor — a device for compressing a gas by accelerating it tangentially by means of bladed rotors, to increase its kinetic energy, and then diffusing it through static vanes (stators), to increase its pressure
- axiom of countability — the property satisfied by a topological space in which the neighborhood system of each point has a base consisting of a countable number of neighborhoods (first axiom of countability) or the property satisfied by a topological space that has a base for its topology consisting of a countable number of subsets of the space (second axiom of countability)
- baton de commandement — an antler object found in Upper Palaeolithic sites from the Aurignacian period onwards, consisting of a rod, often ornately decorated, with a hole through the thicker end
- behavior modification — a technique that seeks to modify animal and human behavior through application of the principles of conditioning, in which rewards and reinforcements, or punishments, are used to establish desired habits, or patterns of behavior
- behind someone's back — without someone's knowledge or consent
- benzalkonium chloride — a white or yellowish-white, water-soluble mixture of ammonium chloride derivatives having the structure C 8 H 10 NRCl, where R is a mixture of radicals ranging from C 8 H 17 – to C 18 H 37 –, that occurs as an amorphous powder or in gelatinous lumps: used chiefly as an antiseptic and a disinfectant.
- binomial nomenclature — a system for naming plants and animals by means of two Latin names: the first indicating the genus and the second the species to which the organism belongs, as in Panthera leo (the lion)
- black-headed fireworm — the larva of any of several moths, as Rhopobota naevana (black-headed fireworm) which feeds on the leaves of cranberries and causes them to wither.
- book of common prayer — the official book of church services of the Church of England, until 1980, when the Alternative Service Book was sanctioned
- bottlebrush moustache — a short, bristly moustache
- british north america — (formerly) Canada or its constituent regions or provinces that formed part of the British Empire
- bryan-chamorro treaty — a treaty (1914) between the U.S. and Nicaragua by which the U.S. secured exclusive rights to build a canal across Nicaragua, to connect the Atlantic and Pacific.
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