17-letter words containing t, a, c, o, n

nationalistically — In a nationalistic manner.
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 resources — a naturally occurring source of wealth, as land or water.
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.
natural-resources — a naturally occurring source of wealth, as land or water.
near-earth object — a comet or asteroid pushed by the gravitational attraction of nearby planets into an orbit that allows it to enter the earth's orbit and thereby pose a danger of collision. Abbreviation: NEO.
neo-scholasticism — a contemporary application of Scholasticism to modern problems and life.
nephelometrically — By means of nephelometry.
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.
new scotland yard — See under Scotland Yard (def 1).
ninth commandment — “Thou shalt not bear false witness against thy neighbor”: ninth of the Ten Commandments.
nitrogen narcosis — a semistupor, lightheadedness, or euphoria experienced by deep-sea divers when nitrogen from air enters the blood at higher than atmospheric pressure.
nitroxanthic acid — picric acid.
non-accommodation — the act of accommodating; state or process of being accommodated; adaptation.
non-certification — the act of certifying.
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-confrontation — an act of confronting.
non-consideration — the act of considering; careful thought; meditation; deliberation: I will give your project full consideration.
non-containerized — to package (freight) in uniform, sealed containers for shipment.
non-contamination — the act of contaminating, or of making something impure or unsuitable by contact with something unclean, bad, etc.
non-controversial — of, relating to, or characteristic of controversy, or prolonged public dispute, debate, or contention; polemical: a controversial book.
non-discretionary — subject or left to one's own discretion.
non-incriminating — to accuse of or present proof of a crime or fault: He incriminated both men to the grand jury.
non-instructional — the act or practice of instructing or teaching; education.
non-materialistic — excessively concerned with physical comforts or the acquisition of wealth and material possessions, rather than with spiritual, intellectual, or cultural values.
non-reciprocating — to give, feel, etc., in return.
non-retroactivity — operative with respect to past occurrences, as a statute; retrospective: a retroactive law.
non-stereotypical — a process, now often replaced by more advanced methods, for making metal printing plates by taking a mold of composed type or the like in papier-mâché or other material and then taking from this mold a cast in type metal.
non-thermoplastic — soft and pliable when heated, as some plastics, without any change of the inherent properties.
nonaccomplishment — Something that does not achieve the intended goal.
nonconstitutional — of or relating to the constitution of a state, organization, etc.
nondiscriminating — differentiating; analytical.
nondiscrimination — an act or instance of discriminating, or of making a distinction.
nondiscriminatory — characterized by or showing prejudicial treatment, especially as an indication of bias related to age, color, national origin, religion, sex, etc.: discriminatory practices in housing; a discriminatory tax.
nonimpact printer — a printer that creates images without mechanically impacting the page, as an ink-jet or laser printer.
nonteaching staff — employees within an academic or vocational environment whose jobs do not involve teaching
north miami beach — a city in SE Florida.
northcountrywoman — a female native or inhabitant of the North of England
northern michigan — the peninsula between lakes Superior and Michigan constituting the N part of Michigan. Abbreviation: U.P.
norwegian current — an ocean current formed from the terminus of the North Atlantic Current, flowing N along the Norwegian coast into the Barents Sea.
not mince matters — to speak frankly
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.
nuclear threshold — the point in war at which a combatant brings nuclear weapons into use
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
objectionableness — The quality of being objectionable.
occipital condyle — a protrusion on the occipital bone of the skull that forms a joint with the first cervical vertebra, enabling the head to move relative to the neck.

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