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17-letter words containing a, d, e, l, n, t

  • mundane astrology — the astrology of worldly events, in contrast to the astrology of the individual: used especially in interpretations and forecasts involving politics, the stock market, weather, and disasters.
  • musical interlude — an interval in a play, event or occasion during which music is played
  • mutual inductance — the ratio of the electromotive force in one of two circuits to the rate of change of current in the other circuit.
  • naked singularity — an infinitely dense point mass without a surrounding black hole
  • national identity — characteristics of a given nationality
  • 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).
  • new england aster — a tall composite plant, Aster novae-angliae, of the northeastern U.S., the flowers of which have lavender to deep-purple rays.
  • new scotland yard — See under Scotland Yard (def 1).
  • newcastle disease — a rapidly spreading virus-induced disease of birds and domestic fowl, as chickens, marked by respiratory difficulty, reduced egg production and, in chicks, paralysis.
  • newfoundland time — a form of civil time observed on the island of Newfoundland, one and one-half hours later than Eastern time and a half hour later than Atlantic time.
  • nial systems ltd. — Distributors of Q'NIAL. Address: Ottawa Canada. Telephone: Canada (613) 234 4188.
  • nightshade family — the plant family Solanaceae, characterized by herbaceous plants, trees, shrubs, and vines having alternate, simple or pinnate leaves, conspicuous flowers, and fruit in the form of a berry or capsule, and including belladonna, eggplant, nightshade, peppers of the genus Capsicum, petunia, potato, tobacco, and tomato.
  • nondenominational — of or relating to a denomination or denominations.
  • nonunderstandable — Not understandable.
  • nord-ostsee kanal — German name of Kiel Canal.
  • not bat an eyelid — When something surprising or shocking happens, if someone doesn't bat an eyelid in British English, or doesn't bat an eye in American English, they remain calm and do not show any reaction.
  • nuclear deterrent — a country's nuclear weapons viewed as a deterrent to other countries from attacking
  • 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
  • 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.
  • old red sandstone — a thick sequence of sedimentary rock (generally, but not always, red) deposited in Britain and NW Europe during the Devonian period
  • on the barrelhead — upon being presented for sale; at the time of delivery
  • online dictionary — a dictionary that is available on the Internet or World Wide Web and accessed through a Web browser using a computer or a mobile device, primarily by typing a query term into a search box on the site. Online dictionaries like Dictionary.com offer immediate, direct access through large databases to a word's spelling and meanings, plus a host of ancillary information, including its variant spellings, pronunciation, inflected forms, origin, and derived forms, as well as supplementary notes on matters of interest or concern about how the word is used: Some people think online dictionaries will make print dictionaries obsolete.
  • organized militia — a former military organization functioning under both state and federal authority.
  • overhead lighting — lighting which throws light downwards by being situated on the ceiling or having a downward shade, etc
  • painted greenling — a greenling, Oxylebius pictus, inhabiting the Pacific coastal waters of North America, having a whitish body marked with black bands.
  • pan and tilt head — a mounting device on which a camera may be rotated in a horizontal plane (pan) or in a vertical plane (tilt)
  • personal distance — personal space.
  • phenylacetic acid — a white crystalline, aromatic acid, C 8 H 8 O 2 , used in the manufacture of penicillin and in perfumes.
  • phumiphon aduldet — (Phumiphon Aduldet; Bhumibol Adulyadej) born 1927, king of Thailand since 1946.
  • pillar-and-breast — room-and-pillar.
  • platinic chloride — chloroplatinic acid.
  • plug and feathers — an apparatus for splitting stone, consisting of two tapered bars (feathers) inserted into a hole drilled into the stone, between which a narrow wedge (plug) is hammered to spread them.
  • polar coordinates — Usually, polar coordinates. one of two coordinates used to locate a point in a plane by the length of its radius vector and the angle this vector makes with the polar axis (polar angle)
  • police department — A police department is an official organization which is responsible for making sure that people obey the law.
  • post-and-rail tea — (in the 19th century) a coarse tea in which floating particles resembled a post-and-rail fence
  • post-depositional — removal from an office or position.
  • postural drainage — a therapy for clearing congested lungs by placing the patient in a position for drainage by gravity, often accompanied by percussion with hollowed hands.
  • potential divider — a resistor or series of resistors connected to a voltage source and used to provide voltages that are fractions of that of the source.
  • product placement — Product placement is a form of advertising in which a company has its product placed where it can be clearly seen during a film or television programme.
  • production values — the quality of a media production (such as a film) in regards to elements such as colours, quality, style, etc
  • psychoeducational — designating or of psychological methods, as intelligence tests, used in evaluating learning ability
  • put on a pedestal — an architectural support for a column, statue, vase, or the like.
  • quattuordecillion — a cardinal number represented in the U.S. by 1 followed by 45 zeros, and in Great Britain by 1 followed by 84 zeros.
  • radio in the loop — Wireless Local Loop
  • rattle one's dags — to hurry up
  • recreational drug — drug taken for pleasure
  • red and the black — a novel (1832) by Stendhal.
  • reduction formula — a formula, such as sin (90° ± A) = cos A, expressing the values of a trigonometric function of any angle greater than 90° in terms of a function of an acute angle
  • regulated tenancy — (in Britain) the letting of a dwelling by a nonresident private landlord, usually at a registered fair rent, from which the landlord cannot evict the tenant without a possession order from a court
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