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17-letter words containing a, t, o, r

  • associative array — (programming)   (Or "hash", "map", "dictionary") An array where the indices are not just integers but may be arbitrary strings.
  • astral projection — the departure of the astral body from the physical body, in order to travel to the astral plane
  • astronomical unit — a unit of distance used in astronomy equal to the mean distance between the earth and the sun. 1 astronomical unit is equivalent to 1.495 × 1011 metres or about 9.3 × 107 miles
  • astronomical year — year (def 4b).
  • astrophotographer — A person, especially an astronomer, who takes photographs of the stars.
  • at close quarters — If you do something at close quarters, you do it very near to a particular person or thing.
  • at cross purposes — an opposing or contrary purpose.
  • at cross-purposes — If people are at cross-purposes, they do not understand each other because they are working towards or talking about different things without realizing it.
  • at one's own risk — If you tell someone that they are doing something at their own risk, you are warning them that, if they are harmed, it will be their own responsibility.
  • at swords' points — ready to quarrel or fight
  • at the request of — in accordance with the specific demand or wish of (someone)
  • at the service of — To be at the service of a person or organization means to be available to help or be used by that person or organization.
  • at their own game — If you beat someone at their own game, you use the same methods that they have used, but more successfully, so that you gain an advantage over them.
  • attachment theory — a set of concepts that explain the emergence of an emotional bond between an infant and primary caregiver and the way in which this bond affects the child’s behavioral and emotional development into adulthood. See also attachment (def 3a).
  • attendance record — the record of how often a person has attended an institution such as a school
  • attorneys-in-fact — a person authorized by power of attorney to act on the authorizer's behalf outside a court of law.
  • attraction sphere — centrosphere (sense 1)
  • audio description — a facility provided for visually impaired people in which a film, television programme, or play is described through audio technology
  • aurea mediocritas — the golden mean.
  • australian ballot — an official ballot listing candidates for election to public office and issues, levies, etc., distributed inside the polling place to be marked by the voter in secret: it originated in Australia and is widely used in the U.S.
  • australopithecine — any of various extinct apelike primates of the genus Australopithecus and related genera, remains of which have been discovered in southern and E Africa. Some species are estimated to be over 4.5 million years old
  • authoritativeness — having due authority; having the sanction or weight of authority: an authoritative opinion.
  • authority control — the establishment and maintainance of consistent forms of terms, as of names, subjects, and titles, to be used as headings in bibliographic records.
  • autocorrelational — Of or pertaining to autocorrelation.
  • automatic writing — writing performed without apparent intent or conscious control, especially to achieve spontaneity or uncensored expression.
  • auxiliary storage — secondary storage.
  • average deviation — a measure of dispersion, computed by taking the arithmetic mean of the absolute values of the deviations of the functional values from some central value, usually the mean or median.
  • aviation industry — a collective term for the companies involved in air transport
  • avogadro constant — the number of atoms or molecules in a mole of a substance
  • axis of ordinates — y-axis (def 1).
  • axis-of-ordinates — y-axis (def 1).
  • bachelor's button — any of several plants of a genus (Centaurea) of the composite family, that have scaly, vase-shaped bracts below the white, pink, or blue flowers; esp., the cornflower and knapweed
  • bachelor's-button — any of various plants with round flower heads, especially the cornflower.
  • back on the rails — If something is back on the rails, it is beginning to be successful again after a period when it almost failed.
  • background report — a report on someone or something that sheds light on their background, esp a report on the background of a person convicted of a crime before they are sentenced by a judge
  • bacteriologically — In a bacteriological manner; with respect to bacteriology.
  • bacteriorhodopsin — a purple protein containing retinal and found in the plasma membrane of certain bacteria (genus Halobacterium): it directly supplies electrochemical energy from sunlight
  • balance of nature — the stable state in which natural communities of animals and plants exist, maintained by adaptation, competition, and other interactions between members of the communit ies and their nonliving environment
  • balance of terror — military deterrence based on the possession of weapons of mass destruction by opponents in a conflict
  • bald-faced hornet — any large, stinging paper wasp of the family Vespidae, as Vespa crabro (giant hornet) introduced into the U.S. from Europe, or Vespula maculata (bald-faced hornet or white-faced hornet) of North America.
  • baltimore clipper — a small, fast American sailing vessel of the early 19th century, having a sharp hull form and two masts with a pronounced rake and carrying a brig or schooner rig.
  • bangalore torpedo — an explosive device in a long metal tube, used to blow gaps in barbed-wire barriers
  • bar-tailed godwit — a large wader, Limosa lapponica, of the family Scolopacidae which, in migrating from Alaska to New Zealand, makes the longest journey without stopping for food taken by any animal
  • barchester towers — a novel (1857) by Anthony Trollope.
  • barrel distortion — distortion of an image produced by an optical system that causes straight lines at image margins to bulge outwards
  • bartholin's gland — either of two small glands near the vaginal opening: during sexual excitement they secrete a mucous lubricating substance
  • baseboard heating — a heating system by pipes, through which steam or hot water circulates, near the base of the walls of rooms
  • basic proposition — protocol (def 6).
  • bathroom fittings — plumbing fixtures or accessories suitable for use in a bathroom
  • battle of britain — (in World War II) the series of aerial combats that took place between British and German aircraft during the autumn of 1940 and that included the severe bombardment of British cities.
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