0%

17-letter words containing a, u, c, t, i, o

  • munitions factory — a factory where munitions are made
  • muscae volitantes — floater (def 6).
  • nasolacrimal duct — a membranous canal extending from the lacrimal sac to the nasal cavity, through which tears are discharged into the nose.
  • national security — defence of a country
  • natural deduction — (logic)   A set of rules expressing how valid proofs may be constructed in predicate logic. In the traditional notation, a horizontal line separates premises (above) from conclusions (below). Vertical ellipsis (dots) stand for a series of applications of the rules. "T" is the constant "true" and "F" is the constant "false" (sometimes written with a LaTeX \perp). "^" is the AND (conjunction) operator, "v" is the inclusive OR (disjunction) operator and "/" is NOT (negation or complement, normally written with a LaTeX \neg). P, Q, P1, P2, etc. stand for propositions such as "Socrates was a man". P[x] is a proposition possibly containing instances of the variable x, e.g. "x can fly". A proof (a sequence of applications of the rules) may be enclosed in a box. A boxed proof produces conclusions that are only valid given the assumptions made inside the box, however, the proof demonstrates certain relationships which are valid outside the box. For example, the box below labelled "Implication introduction" starts by assuming P, which need not be a true proposition so long as it can be used to derive Q. Truth introduction: - T (Truth is free). Binary AND introduction: ----------- | . | . | | . | . | | Q1 | Q2 | ----------- Q1 ^ Q2 (If we can derive both Q1 and Q2 then Q1^Q2 is true). N-ary AND introduction: ---------------- | . | .. | . | | . | .. | . | | Q1 | .. | Qn | ---------------- Q1^..^Qi^..^Qn Other n-ary rules follow the binary versions similarly. Quantified AND introduction: --------- | x . | | . | | Q[x] | --------- For all x . Q[x] (If we can prove Q for arbitrary x then Q is true for all x). Falsity elimination: F - Q (Falsity opens the floodgates). OR elimination: P1 v P2 ----------- | P1 | P2 | | . | . | | . | . | | Q | Q | ----------- Q (Given P1 v P2, if Q follows from both then Q is true). Exists elimination: Exists x . P[x] ----------- | x P[x] | | . | | . | | Q | ----------- Q (If Q follows from P[x] for arbitrary x and such an x exists then Q is true). OR introduction 1: P1 ------- P1 v P2 (If P1 is true then P1 OR anything is true). OR introduction 2: P2 ------- P1 v P2 (If P2 is true then anything OR P2 is true). Similar symmetries apply to ^ rules. Exists introduction: P[a] ------------- Exists x.P[x] (If P is true for "a" then it is true for all x). AND elimination 1: P1 ^ P2 ------- P1 (If P1 and P2 are true then P1 is true). For all elimination: For all x . P[x] ---------------- P[a] (If P is true for all x then it is true for "a"). For all implication introduction: ----------- | x P[x] | | . | | . | | Q[x] | ----------- For all x . P[x] -> Q[x] (If Q follows from P for arbitrary x then Q follows from P for all x). Implication introduction: ----- | P | | . | | . | | Q | ----- P -> Q (If Q follows from P then P implies Q). NOT introduction: ----- | P | | . | | . | | F | ----- / P (If falsity follows from P then P is false). NOT-NOT: //P --- P (If it is not the case that P is not true then P is true). For all implies exists: P[a] For all x . P[x] -> Q[x] ------------------------------- Q[a] (If P is true for given "a" and P implies Q for all x then Q is true for a). Implication elimination, modus ponens: P P -> Q ---------- Q (If P and P implies Q then Q). NOT elimination, contradiction: P /P ------ F (If P is true and P is not true then false is true).
  • natural harmonics — harmonics of a note produced on a stringed instrument by lightly touching an open or unstopped sounded string.
  • natural selection — the process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators, changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of their kind, thus ensuring the perpetuation of those favorable traits in succeeding generations.
  • neuropathological — (medicine) Of, pertaining to, or arising from neuropathology, the pathology of nerve tissue.
  • neuropsychiatrist — A medical doctor specializing in neuropsychiatry; a medical doctor dealing with disorders that have both neurological and psychiatric features.
  • non-communication — the act or process of communicating; fact of being communicated.
  • non-communicative — inclined to communicate or impart; talkative: He isn't feeling very communicative today.
  • non-instructional — the act or practice of instructing or teaching; education.
  • nonconstitutional — of or relating to the constitution of a state, organization, etc.
  • norwegian current — an ocean current formed from the terminus of the North Atlantic Current, flowing N along the Norwegian coast into the Barents Sea.
  • nuclear radiation — Physics. radiation in the form of elementary particles emitted by an atomic nucleus, as alpha rays or gamma rays, produced by decay of radioactive substances or by nuclear fission.
  • numerical control — control of a machine tool, or other device used in a manufacturing process, by a computer, other control circuitry, or recorded digital commands.
  • nursery education — education provided at a school for young children, usually from three to five years old
  • odour of sanctity — sanctimoniousness
  • office automation — a method or system of using automated or electronic equipment, as word processors and computers, in the operations of an office.
  • olympic mountains — a mountain range in NW Washington: part of the Coast Range. Highest peak: Mount Olympus, 2427 m (7965 ft)
  • opportunistically — adhering to a policy of opportunism; practicing opportunism.
  • optical computing — (hardware)   (Or "Optical Signal Processing") Operating on data represented using electromagnetic radiation, e.g. visible light, instead of the electrical signals used in a conventional electronic digital computer. Electronic digital computers are built from transistors. These form components that store data and logic gates that perform the low-level Boolean operations such as AND, OR and NOT that are the basis of all digital computation. The optical equivalent requires material with a non-linear refractive index such that light beams can interact with each other to perform the same Boolean operations. Though the photons that carry optical signals offer some theoretical advantages over the electrons that carry electronic signals, there are many practical problems that would have to be overcome before optical computing could compete in terms of cost, power and speed.
  • organ-pipe cactus — a treelike or columnar cactus, Lemaireocereus marginatus, of Mexico, having a central, erect spine surrounded by spreading spines in clusters of five to eight, and funnel-shaped, brownish-purple flowers.
  • osculating circle — circle of curvature.
  • outside broadcast — An outside broadcast is a radio or television programme that is not recorded or filmed in a studio, but in another building or in the open air.
  • palace revolution — a challenge to or overthrow of a sovereign or other leader by members of the ruling family or group.
  • papanicolaou test — Pap test.
  • particularization — to make particular.
  • per procurationem — by one acting as an agent; by proxy.
  • phototherapeutics — the branch of therapeutics that deals with the curative use of light rays.
  • pincushion cactus — any of various low-growing, spiny cacti of the genus Mammillaria.
  • pinpoint accuracy — extreme accuracy
  • pitot-static tube — a device combining a Pitot tube with a static tube: used to measure airspeed.
  • point of purchase — designating or in use at a retail outlet where an item can be purchased; point-of-sale: point-of-purchase displays to entice the buyer.
  • point-of-purchase — designating or in use at a retail outlet where an item can be purchased; point-of-sale: point-of-purchase displays to entice the buyer.
  • political refugee — a person who has fled from a homeland because of political persecution.
  • poststructuralism — a variation of structuralism, often seen as a critique, emphasizing plurality of meaning and instability of concepts that structuralism uses to define society, language, etc.
  • potassium acetate — a white, crystalline, deliquescent, water-soluble powder, KC 2 H 3 O 2 , used chiefly as a reagent in analytical chemistry.
  • potassium cyanide — a white, granular, water-soluble, poisonous powder, KCN, having a faint almondlike odor, used chiefly in metallurgy and photography.
  • pre-communication — the act or process of communicating; fact of being communicated.
  • pre-configuration — the relative disposition or arrangement of the parts or elements of a thing.
  • pre-qualification — a quality, accomplishment, etc., that fits a person for some function, office, or the like.
  • prerogative court — a former ecclesiastical court in England and Ireland for the trial of certain testamentary cases.
  • primary education — junior, elementary schooling
  • private education — education provided by a private individual or organization, rather than by the state or a public body
  • probability curve — a curve that describes the distribution of probability over the values of a random variable.
  • procurator fiscal — In the Scottish legal system, the procurator fiscal is a public official who puts people on trial.
  • product liability — the responsibility of a manufacturer for injury or loss caused by its product.
  • production values — the quality of a media production (such as a film) in regards to elements such as colours, quality, style, etc
  • prostatic utricle — a small pouch near the prostate gland that opens into the urethra.
Was this page helpful?
Yes No
Thank you for your feedback! Tell your friends about this page
Tell us why?