21-letter words containing p, a, c, e, y
- a nasty piece of work — If you say that someone is a nasty piece of work, you mean that they are very unkind or unpleasant.
- acceptable use policy — (networking) (AUP) Rules applied by many transit networks which restrict the use to which the network may be put. A well known example is NSFNet which does not allow commercial use. Enforcement of AUPs varies with the network.
- active matrix display — (hardware) A type of liquid crystal display where each display element (each pixel) includes an active component such as a transistor to maintain its state between scans. Contrast passive matrix display.
- advanced photo system — a system that enables photographs in different formats to be taken on the same (small) roll of film
- alpha centauri system — a star system comprising the binary star Alpha Centauri A and B and Proxima Centauri (also called Alpha Centauri C), which is 0.1 light years closer to the sun. Visual magnitude: 0.01 (A), 1.33 (B); spectral type: G2V (A); distance from earth: 4.3 light years
- 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.
- beta-naphthyl radical — Also called alpha-naphthyl group, alpha-naphthyl radical. the univalent group C 1 0 H 7 –, having a replaceable hydrogen atom in the first, or alpha, position; 1-naphthyl group.
- book of common prayer — the official book of church services of the Church of England, until 1980, when the Alternative Service Book was sanctioned
- cheese and wine party — a party at which cheese and wine are served
- comparative philology — comparative linguistics.
- componential analysis — the analysis of a set of related linguistic items, especially word meanings, into combinations of features in terms of which each item may be compared with every other, as in the analysis of man into the semantic features “male,” “mature,” and “human,” woman into “female,” “mature,” and “human,” girl into “female,” “immature,” and “human,” and bull into “male,” “mature,” and “bovine.”.
- confidence and supply — denoting an arrangement in a hung parliament in which an opposition party agrees not to vote against a minority government in votes of confidence or budgetary matters but reserves the right to oppose other legislation
- conspiracy of silence — If there is a conspiracy of silence about something, people who know about it have agreed that they will not talk publicly about it, although it would probably be a good thing if people in general knew about it.
- corporate hospitality — Corporate hospitality is the entertainment that a company offers to its most valued clients, for example by inviting them to sporting events and providing them with food and drink.
- countably compact set — a set for which every cover consisting of a countable number of sets has a subcover consisting of a finite number of sets.
- cyclical unemployment — unemployment caused by fluctuations in the level of economic activity inherent in trade cycles
- cyclomatic complexity — (programming, testing) A measure of the number of linearly independent paths through a program module. Cyclomatic complexity is a measure for the complexity of code related to the number of ways there are to traverse a piece of code. This determines the minimum number of inputs you need to test all ways to execute the program.
- deep scattering layer — any of the stratified zones in the ocean which reflect sound during echo sounding, usually composed of marine organisms which migrate vertically from c. 250 to 800 m (c. 820 to 2,625 ft)
- displacement activity — a behavior performed out of its usual context and apparently irrelevant to the prevailing situation, as eating when an unknown individual approaches, tending to occur when appropiate behaviors, as attacking or fleeing, are in conflict or obstructed.
- electrochromatography — chromatography effected by the influence of an applied electric field
- electromyographically — By means of, or in terms of, electromyography.
- electronystagmography — A diagnostic test to record involuntary movements of the eye caused by a condition known as nystagmus. It can also be used to diagnose the cause of vertigo, dizziness or balance dysfunction by testing the vestibular system.
- empirical probability — a measure or estimate of the degree of confidence one may have in the occurrence of an event, defined as the proportion observed in a sample
- european space agency — an organization dedicated to space exploration with 18 European countries as members
- forensic anthropology — the branch of physical anthropology in which anthropological data, criteria, and techniques are used to determine the sex, age, genetic population, or parentage of skeletal or biological materials in questions of civil or criminal law.
- functional dependency — (database) Given a relation R (in a relational database), attribute Y of R is functionally dependent on attribute X of R and X of R functionally determines Y of R (in symbols R.X -> R.Y) if and only if each X in R has associated with it precisely one Y in R (at any one time). Attributes X and Y may be composite. This is very close to a function in the mathematical sense.
- generic type variable — (programming) (Also known as a "schematic type variable"). Different occurrences of a generic type variable in a type expression may be instantiated to different types. Thus, in the expression let id x = x in (id True, id 1) id's type is (for all a: a -> a). The universal quantifier "for all a:" means that a is a generic type variable. For the two uses of id, a is instantiated to Bool and Int. Compare this with let id x = x in let f g = (g True, g 1) in f id This looks similar but f has no legal Hindley-Milner type. If we say f :: (a -> b) -> (b, b) this would permit g's type to be any instance of (a -> b) rather than requiring it to be at least as general as (a -> b). Furthermore, it constrains both instances of g to have the same result type whereas they do not. The type variables a and b in the above are implicitly quantified at the top level: f :: for all a: for all b: (a -> b) -> (b, b) so instantiating them (removing the quantifiers) can only be done once, at the top level. To correctly describe the type of f requires that they be locally quantified: f :: ((for all a: a) -> (for all b: b)) -> (c, d) which means that each time g is applied, a and b may be instantiated differently. f's actual argument must have a type at least as general as ((for all a: a) -> (for all b: b)), and may not be some less general instance of this type. Type variables c and d are still implicitly quantified at the top level and, now that g's result type is a generic type variable, any types chosen for c and d are guaranteed to be instances of it. This type for f does not express the fact that b only needs to be at least as general as the types c and d. For example, if c and d were both Bool then any function of type (for all a: a -> Bool) would be a suitable argument to f but it would not match the above type for f.
- gestalt psychotherapy — a therapy devised in the US in the 1960s in which patients are encouraged to concentrate on the immediate present and to express their true feelings
- glyceryl tripalmitate — palmitin.
- hawaiian honeycreeper — any small to medium-sized finches of the subfamily Drepanidinae, native to the Hawaiian Islands and including many rare and extinct species.
- hay-pauncefote treaty — an agreement (1901) between the U.S. and Great Britain giving the U.S. the sole right to build a canal across Central America connecting the Atlantic and Pacific.
- hyperbolic paraboloid — a paraboloid that can be put into a position such that its sections parallel to one coordinate plane are hyperbolas, with its sections parallel to the other two coordinate planes being parabolas.
- hypercholesterolaemia — the condition of having a high concentration of cholesterol in the blood
- imprecise probability — (probability) A probability that is represented as an interval (as opposed to a single number) included in [0,1].
- insulin shock therapy — a former treatment for mental illness, especially schizophrenia, employing insulin-induced hypoglycemia as a method for producing convulsive seizures.
- intellectual property — Law. property that results from original creative thought, as patents, copyright material, and trademarks.
- irish republican army — an underground Irish nationalist organization founded to work for Irish independence from Great Britain: declared illegal by the Irish government in 1936, but continues activity aimed at the unification of the Republic of Ireland and Northern Ireland. Abbreviation: IRA, I.R.A.
- isopropylideneacetone — mesityl oxide.
- locally compact space — a topological space in which each point has a neighborhood that is compact.
- magnetic permeability — permeability (def 2).
- magnetoplasmadynamics — magnetohydrodynamics.
- make a policy paid up — If you make a policy paid up, you stop making premium payments into a life policy but still leave the coverage in place.
- mucopolysaccharidoses — Plural form of mucopolysaccharidosis.
- multilayer perceptron — A network composed of more than one layer of neurons, with some or all of the outputs of each layer connected to one or more of the inputs of another layer. The first layer is called the input layer, the last one is the output layer, and in between there may be one or more hidden layers.
- open graphics library — (graphics, library) (OpenGL) A multi-platform software interface to graphics hardware, supporting rendering and imaging operations. The OpenGL interface was developed by Silicon Graphics, who license it to other vendors. The OpenGL graphics interface consists of several hundred functions operating on 2D and 3D objects, supporting basic techniques, such as modelling and smooth shading, and advanced techniques, such as texture mapping and motion blur. Many operations require a frame buffer. OpenGL is network-transparent, and a common extension to the X Window System allows an OpenGL client to communicate across a network with a different vendor's OpenGL server. OpenGL is based on Silicon Graphics' proprietary IRIS GL.
- pacific daylight time — the version of Pacific Standard Time that is in use when daylight saving time is being observed
- peroxydisulfuric acid — persulfuric acid (def 2).
- physically challenged — See example at challenged (def 1).
- picture quality scale — (graphics) (PQS) A system for rating image quality based upon features of images that affect their perception by the human eye, rather than the traditional signal-to-noise ratio which examines differences for every single pixel.
- piezoelectric crystal — a crystal, such as quartz, that produces a potential difference across its opposite faces when under mechanical stress
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