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21-letter words containing on

  • student participation — the extent to which students participate or involve themselves in a class, course, etc
  • subliminal perception — perception of or reaction to a stimulus that occurs without awareness or consciousness
  • substitution instance — an expression so derived from another
  • substitution reaction — the replacement of an atom or group of atoms in a compound by another atom or group.
  • suction and curettage — a technique involving extraction of the fetus through a suction tube, used to perform abortions during the early stages of pregnancy.
  • sun protection factor — SPF.
  • supergranulation cell — one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.
  • supply-side economics — a school of economic thought that emphasizes the importance to a strong economy of policies that remove impediments to supply
  • surface friction drag — the part of the drag on a body moving through a fluid that is dependent on the nature of the surface of the body
  • surface of projection — the surface upon which an image or a set of points is projected.
  • surface of revolution — a surface formed by revolving a plane curve about a given line.
  • sympathetic vibration — a vibration induced by resonance.
  • symphonie fantastique — a programmatic symphony (1830–31) in five movements by Hector Berlioz.
  • synchronized shifting — gear shifting in which the gears to be meshed are made to rotate at the same speed.
  • synchronized swimming — a sport growing out of water ballet in which swimmers, in solo, duet, and team efforts, complete various required figures by performing motions in relatively stationary positions, along with a freestyle competition, with the contestants synchronizing movements to music and being judged for body position, control, and the degree of difficulty of the moves.
  • synchronous converter — a synchronous machine for converting alternating current to direct current, or vice versa, in which the armature winding is connected to collector rings and to a commutator.
  • synchrotron radiation — electromagnetic radiation emitted by charged particles as they pass through magnetic fields.
  • systeme international — Système International d'Unités
  • take off one's hat to — a shaped covering for the head, usually with a crown and brim, especially for wear outdoors.
  • take one's (own) life — to commit suicide
  • take one's finger out — stop delaying or procrastinating
  • take one's hat off to — to salute or congratulate
  • take someone prisoner — to capture and hold someone as a prisoner, esp as a prisoner of war
  • take the consequences — to accept the results of one's actions
  • tartarian honeysuckle — an Asian honeysuckle, Lonicera tatarica, having fragrant, white to pink flowers.
  • teacher certification — official qualifications for educators
  • television evangelist — a Christian minister who devotes time to preaching on television
  • temperature inversion — inversion (def 12).
  • tenure track position — a position or office that carries with it the opportunity to eventually obtain tenure or the right to permanent employment
  • terrestrial radiation — long-wave electromagnetic radiation in the form of heat emitted from the earth's surface and atmosphere.
  • the (norman) conquest — the conquering of England by the Normans under William the Conqueror in 1066
  • the acting profession — actors considered as a group
  • the birth of a nation — an American film (1915), directed by D. W. Griffith.
  • the built environment — the buildings and all other things constructed by human beings
  • the comrades marathon — an annual long-distance race run every year on the 16th of June from Durban to Pietermaritzburg, a distance of approximately 90 kilometres (56 miles)
  • the end of one's rope — the end of one's endurance, resources, etc.
  • the executive mansion — the White House
  • the icing on the cake — If you describe something as the icing on the cake, you mean that it makes a good thing even better, but it is not essential.
  • the oldest profession — prostitution
  • the press association — the national news agency for the United Kingdom and Ireland
  • the probation service — a criminal justice service that is mainly responsible for dealing with offenders by placing them under the supervision of a probation officer
  • the scout association — a worldwide movement for boys or (in some countries) girls, founded as the Boy Scouts in England in 1908 by Lord Baden-Powell with the aim of developing character and responsibility
  • the slough of despond — a state of extreme despondency, depression or degradation
  • the sooner the better — You say the sooner the better when you think something should be done as soon as possible.
  • the stationery office — (in the UK) the company that supplies the civil service with all its office supplies, machinery, printing and binding, etc
  • theater of operations — the part of the theater of war, including a combat zone and a communications zone, that is engaged in military operations and their support.
  • thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
  • thermal power station — a power station in which heat is converted into electricity
  • throw one's hat at it — to give up all hope of getting or achieving something
  • throw someone a curve — a continuously bending line, without angles.
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