16-letter words containing a, c, k, n
- acknowledgements — Plural form of acknowledgement.
- adiadochokinesia — the inability to perform rapidly alternating muscular movements, as flexion and extension.
- adiadochokinesis — the inability to perform rapidly alternating muscular movements, as flexion and extension.
- adirondack chair — a sturdy armchair for outdoor use, made of wide wooden slats, with a sloping back and a seat often slanting down toward it.
- alexander dubcek — Alexander, 1921–92, Czechoslovakian political leader: first secretary of the Communist Party 1968–69.
- alternative rock — a broad category of popular rock music typically regarded as somewhat out of the mainstream and variously including elements of punk rock, heavy metal, folk music, etc.
- ambulance stocks — high-performance stocks and shares recommended by a broker to a dissatisfied client to improve their relationship
- ambulance worker — any person who works in the ambulance service
- american kestrel — a small American falcon (Falco sparverius) with a reddish-brown back and tail; sparrow hawk
- aniakchak crater — an active volcanic crater on the Alaskan Peninsula, with a diameter of 6 miles (10 km).
- anode dark space — the dark region between the anode glow and the anode in a vacuum tube, occurring when the pressure is low.
- answer-back code — a unique code that identifies the telex machine to which a message is sent
- aquidneck island — an island in Narragansett Bay, Rhode Island.
- armchair banking — the management of one's bank account or accounts using a computer, telephone, or television in the home or via the postal system
- around the clock — continuing without pause or interruption: an around-the-clock guard on the prisoner.
- around-the-clock — all day and all night
- aston dark space — the dark region between the cathode and the cathode glow in a vacuum tube, occurring when the pressure is low.
- atlantic croaker — a person or thing that croaks.
- auckland islands — a group of six uninhabited islands, south of New Zealand. Area: 611 sq km (234 sq miles)
- back-propagation — (Or "backpropagation") A learning algorithm for modifying a feed-forward neural network which minimises a continuous "error function" or "objective function." Back-propagation is a "gradient descent" method of training in that it uses gradient information to modify the network weights to decrease the value of the error function on subsequent tests of the inputs. Other gradient-based methods from numerical analysis can be used to train networks more efficiently. Back-propagation makes use of a mathematical trick when the network is simulated on a digital computer, yielding in just two traversals of the network (once forward, and once back) both the difference between the desired and actual output, and the derivatives of this difference with respect to the connection weights.
- background check — an investigation into a person's origins and previous history
- background music — music of any kind that is played while some other activity is going on, so that people do not actively attend to it
- background noise — any type of noise that is not the sound that you are specifically listening to or monitoring
- background paper — a report or other piece of writing that is intended to provide contextual and historical information that will help people understand a particular topic or situation
- backus-naur form — (language, grammar) (BNF, originally "Backus Normal Form") A formal metasyntax used to express context-free grammars. Backus Normal Form was renamed Backus-Naur Form at the suggestion of Donald Knuth. BNF is one of the most commonly used metasyntactic notations for specifying the syntax of programming languages, command sets, and the like. It is widely used for language descriptions but seldom documented anywhere (how do you document a metasyntax?), so that it must usually be learned by osmosis (but see RFC 2234). Consider this BNF for a US postal address:
::= ::= | "." ::= [ ] | ::= [ ] ::= "," This translates into English as: "A postal-address consists of a name-part, followed by a street-address part, followed by a zip-code part. A personal-part consists of either a first name or an initial followed by a dot. A name-part consists of either: a personal-part followed by a last name followed by an optional "jr-part" (Jr., Sr., or dynastic number) and end-of-line, or a personal part followed by a name part (this rule illustrates the use of recursion in BNFs, covering the case of people who use multiple first and middle names and/or initials). A street address consists of an optional apartment specifier, followed by a street number, followed by a street name. A zip-part consists of a town-name, followed by a comma, followed by a state code, followed by a ZIP-code followed by an end-of-line." Note that many things (such as the format of a personal-part, apartment specifier, or ZIP-code) are left unspecified. These lexical details are presumed to be obvious from context or specified somewhere nearby. There are many variants and extensions of BNF, possibly containing some or all of the regexp wild cards such as "*" or "+". EBNF is a common one. In fact the example above isn't the pure form invented for the ALGOL 60 report. "[]" was introduced a few years later in IBM's PL/I definition but is now universally recognised. ABNF is another extension. - backward-looking — If you describe someone or something as backward-looking, you disapprove of their attitudes, ideas, or actions because they are based on old-fashioned opinions or methods.
- bacterial canker — a disease of plants, characterized by cankers and usually by exudation of gum, caused by bacteria, as of the genera Pseudomonas and Corynebacterium.
- bacterioplankton — (biology) The bacterial component of marine plankton.
- badminton racket — the type of racket used in games of badminton
- bankruptcy court — a section of the United States federal court which specializes in the handling of bankruptcy cases
- bankruptcy order — a court order appointing a receiver to manage the property of a debtor or bankrupt
- birchbark biting — a Native Canadian craft in which designs are bitten onto bark from birch trees
- bismarck herring — marinaded herring, served cold
- black nightshade — a poisonous solanaceous plant, Solanum nigrum, a common weed in cultivated land, having small white flowers with backward-curved petals and black berry-like fruits
- black propaganda — propaganda that does not come from the source it claims to come from
- black-eyed susan — any of several North American plants of the genus Rudbeckia, esp R. hirta, having flower heads of orange-yellow rays and brown-black centres: family Asteraceae (composites)
- blink comparator — an optical instrument used to detect small differences in two photographs of the same field or object by viewing them alternately, switching rapidly from one to the other.
- block and tackle — a hoisting device in which a rope or chain is passed around a pair of blocks containing one or more pulleys. The upper block is secured overhead and the lower block supports the load, the effort being applied to the free end of the rope or chain
- blow one's stack — to lose one's temper; fly into a rage
- bracknell forest — a unitary authority in SE England, in E Berkshire. Pop: 110 100 (2003 est). Area: 109 sq km (42 sq miles)
- braking distance — the distance a vehicle travels from the point at which its brakes are applied to the point at which it comes to a stop
- break one's back — to overwork or work very hard
- break one's neck — to exert oneself greatly, esp by hurrying, in order to do something
- brick-and-mortar — pertaining to conventional stores, businesses, etc., having physical buildings and facilities, as opposed to Internet or remote services.
- buckley's chance — no chance at all
- buckthorn family — the plant family Rhamnaceae, characterized by shrubs and trees having alternate, simple leaves, clusters of small flowers, and fruit in the form of a drupe or capsule, and including the buckthorn, cascara, and New Jersey tea.
- cache on a stick — (architecture) (COAST) Intel Corporation attempt to's standardise the modular L2 cache subsystem in Pentium-based computers. A COAST module should be about 4.35" wide by 1.14" high. According to earlier specifications from Motorola, a module between 4.33" and 4.36" wide, and between 1.12" and 1.16" high is within the COAST standard. Some module vendors, including some major motherboard suppliers, greatly violate the height specification. Another COAST specification violated by many suppliers concerns clock distribution in synchronous modules. The specification requires that the clock tree to each synchronous chip be balanced, i.e. equal length from edge of the connector to individual chips. An unbalanced clock tree increases reflections and noise. For a 256 kilobyte cache module the standard requires the same clock be used for both chips but some vendors use separate clocks to reduce loading on the clock driver and hence increase the clock speed. However, this creates unbalanced loading in other motherboard configurations, such as motherboards with soldered caches in the system.
- canadian hemlock — eastern hemlock.
- canandaigua lake — a lake in W central New York: one of the Finger Lakes.
- cantankerousness — disagreeable to deal with; contentious; peevish: a cantankerous, argumentative man.
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