17-letter words starting with na
- naked singularity — an infinitely dense point mass without a surrounding black hole
- nakhon ratchasima — a city in central Thailand.
- naming convention — 1. (programming) variable naming convention. 2. (networking) Universal Naming Convention.
- nanotechnological — Of, pertaining to, or by means of nanotechnology.
- narrow-shouldered — having shoulders which do not extend very far from the neck; not broad-shouldered
- nashville warbler — a North American wood warbler, Vermivora ruficapilla, having a gray head, an olive-green back, and yellow underparts.
- nasolacrimal duct — a membranous canal extending from the lacrimal sac to the nasal cavity, through which tears are discharged into the nose.
- nathaniel currier — Nathaniel, 1813–88, U.S. lithographer. Compare Ives (def 4).
- national assembly — the body constituted by the French Third Estate in June 1789 after the calling of the Estates General. It was dissolved in Sept 1791 to be replaced by the new Legislative Assembly
- national cemetery — a cemetery, maintained by the U.S. government, for persons who have served honorably in the armed forces.
- national covenant — an agreement (1638) among Scottish Presbyterians to uphold their faith in Scotland.
- national heritage — country's cultural legacy
- national identity — characteristics of a given nationality
- national monument — a monument, as a historic site or geographical area, owned and maintained in the public interest by the federal government.
- national seashore — an area of seacoast set aside and maintained by the U.S. government for purposes of recreation or wildlife study.
- national security — defence of a country
- nationalist china — China, Republic of.
- nationalistically — In a nationalistic manner.
- native frangipani — an Australian evergreen tree, Hymenosporum flavum, with large fragrant yellow flowers: family Pittosporaceae
- 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 frequency — the frequency at which a system vibrates when set in free vibration
- natural harmonics — harmonics of a note produced on a stringed instrument by lightly touching an open or unstopped sounded string.
- natural hat trick — three goals scored in succession by one player in one game or one period.
- natural logarithm — a logarithm having e as a base. Symbol: ln.
- 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.
- nausea anesthesia — a loss of the sensation of nausea that is normally stimulated by noxious and disgusting substances.
- nautical twilight — the period of time during which the sun is 12° below the horizon
- naval air station — military airbase for the navy
- naval observatory — an astronomical observatory located in Washington, D.C., operated by the U.S. government, and responsible for the U.S. time service.
- navigation lights — lights on an aircraft
- navigation system — A navigation system is an instrument that determines the position of a vehicle and the route to a particular place.
On this page, we collect all 17-letter words starting with NA. It’s easy to find right word with a certain length. It is the easiest way to find 17-letter word that beginning with NA to use in Scrabble or Crossword puzzles.