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20-letter words containing p, i, r

  • compression ignition — ignition of engine fuel by the heat of air compressed in the cylinders into which the fuel is introduced.
  • computability theory — (mathematics)   The area of theoretical computer science concerning what problems can be solved by any computer. A function is computable if an algorithm can be implemented which will give the correct output for any valid input. Since computer programs are countable but real numbers are not, it follows that there must exist real numbers that cannot be calculated by any program. Unfortunately, by definition, there isn't an easy way of describing any of them! In fact, there are many tasks (not just calculating real numbers) that computers cannot perform. The most well-known is the halting problem, the busy beaver problem is less famous but just as fascinating.
  • computer programming — the activity or profession of writing computer programs
  • computer typesetting — a system for the high-speed composition of type by a device driven by punched paper tape or magnetic tape that has been processed by a computer
  • computing dictionary — Free On-line Dictionary of Computing
  • conditioned response — a response that is transferred from the second to the first of a pair of stimuli. A well-known Pavlovian example is salivation by a dog when it hears a bell ring, because food has always been presented when the bell has been rung previously
  • conferencing over ip — (communications, standard)   (CoIP) Standards for the transmission of multimedia over the Internet. CoIP extends VoIP (voice over Internet Protocol) with text, images, video. The main CoIP standard is based on H.323. The VoIP forum of the IMTC merged with the H.323 Activity Group in January 1999 to form the Conferencing over IP (CoIP) Activity Group. VoIP uses "VoIP Devices" as gateways to route voice data packets over the Internet or PSTN. Protocols such as SGCP and its successor MGCP extend VoIP to handle media other than voice data.
  • conformal projection — a map projection in which angles formed by lines are preserved: a map made using this projection preserves the shape of any small area.
  • connector conspiracy — (business, standard)   The tendency of manufacturers (or, by extension, other designers) to come up with products that don't fit with the old stuff, thereby making you buy either all new stuff or expensive interface devices. The term probably came into prominence with the appearance of the DEC KL-10, none of whose connectors matched anything else. The KL-10 Massbus connector was actually *patented* by DEC, who reputedly refused to licence the design, thus effectively locking out competition for the lucrative Massbus peripherals market. This policy was a source of frustration for the owners of dying, obsolescent disk and tape drives. A related phenomenon is the invention of new screw heads so that only Designated Persons, possessing the magic screwdrivers, can remove covers and make repairs or install options. Older Apple Macintoshes took this one step further, requiring not only a hex wrench but a specialised case-cracking tool to open the box. With the advent of more open-systems computing this term has fallen somewhat into disuse. Compare backward combatability.
  • conservative baptist — a member of a Protestant denomination (Conservative Baptist Association of America) organized in Milwaukee, Wisconsin, in 1948.
  • construction company — a business enterprise concerned with the construction of buildings, bridges, etc
  • consumer price index — The consumer price index is an official measure of the rate of inflation within a country's economy. The abbreviation CPI is also used.
  • contact metamorphism — localized metamorphism resulting from the heat of an igneous intrusion.
  • continued proportion — geometric progression
  • controlled explosion — the deliberate detonation of an explosive device under strictly controlled circumstances
  • conversation stopper — a comment that is so shocking or boring that people stop talking
  • coordination complex — one of a number of complex compounds in which an atom or group of atoms is bound to the central atom by a shared pair of electrons supplied by the coordinated group and not by the central atom
  • corpus juris civilis — the body of Roman or civil law consolidated by Justinian in the 6th century ad. It consists of four parts, the Institutes, Digest, Code, and Novels
  • corresponding angles — a pair of nonadjacent angles, one interior and one exterior, on the same side of a transversal: these paired angles are equal if the lines cut by the transversal are parallel
  • corruption of minors — the criminal offence of inducing people below the age of consent to engage in sexual activity
  • council-manager plan — (in the US) a system of local government with an elected legislative council and an appointed administrative manager
  • counterproliferation — Action intended to prevent an increase or spread in the possession of nuclear weapons.
  • craft apprenticeship — a period of training for a skilled trade in industry, such as for a plumber or electrician
  • craniosacral therapy — a form of therapy for various disorders in which the therapist manipulates the bones of the skull
  • crime and punishment — a novel (1866) by Feodor Dostoevsky.
  • criminal proceedings — action taken in a court to bring a criminal prosecution against someone
  • critical temperature — the temperature of a substance in its critical state. A gas can only be liquefied by pressure alone at temperatures below its critical temperature
  • cycloidal propulsion — propulsion of a vessel by propellers of controllable pitch that steer as well as propel.
  • darkfield microscope — kind of microscope
  • decompartmentalizing — Present participle of decompartmentalize.
  • decomposed petri net — (parallel)   (DPN) A Petri net that has been split into multiple, interconnected nets. This makes it easier to analyse or run the net. DPNs are the basis of concurrency in ConC.
  • deep vein thrombosis — Deep vein thrombosis is a serious medical condition caused by blood clots in the legs moving up to the lungs. The abbreviation DVT is also used.
  • deep-vein thrombosis — a condition in which a blood clot forms in a vein deep beneath the skin, typically in the leg or pelvic area: Immobility and lack of exercise are risk factors for deep-vein thrombosis.
  • definite description — a description that is modified by the definite article or a possessive, such as the woman in white or Rosemary's baby
  • demographic timebomb — a predicted shortage of school-leavers and consequently of available workers, caused by an earlier drop in the birth rate, resulting in an older workforce
  • denali national park — a national park in S central Alaska, including Denali (mountain). 3030 sq. mi. (7850 sq. km).
  • depreciation expense — A depreciation expense is the amount deducted from gross profit to allow for a reduction in the value of something because of its age or how much it has been used.
  • descriptive geometry — the study of the projection of three-dimensional figures onto a plane surface
  • descriptive notation — a method of denoting the squares on the chessboard in which each player names the files from the pieces that stand on them at the opening and numbers the ranks away from himself
  • desmopressin acetate — a vasopressin analogue, C 46 H 64 N 14 O 12 S 2 , used in the treatment of diabetes insipidus.
  • developing-out paper — a sensitized printing paper requiring development in order to bring out the image. Abbreviation: D.O.P.
  • diabetic retinopathy — a disorder of the blood vessels of the retina occurring as a complication of poorly controlled diabetes mellitus and often leading to blindness.
  • diamondback terrapin — any edible North American terrapin of the genus Malaclemys, esp M. terrapin, occurring in brackish and tidal waters and having diamond-shaped markings on the shell: family Emydidae
  • difference amplifier — A difference amplifier is a device that amplifies the difference between two inputs, rejecting any signals common to both.
  • differential pricing — a situation in which different prices are charged for the same product or service
  • digital media player — Digital Technology. a portable electronic device or a software program that plays and stores digital audio or video files in various formats.
  • diplomatic secretary — secretary (def 5).
  • diplomatic-secretary — secretary (def 5).
  • disciplinary hearing — a hearing at which the conduct of a member of an organization, profession etc is examined and a punishment may be handed down
  • dispersion hardening — the strengthening of an alloy as a result of the presence of fine particles in the lattice
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