1. directorship the position of a director of a business concern
  2. doctor's bill statement of charges for medical services
  3. direct sum a union of two disjoint sets in which every element is the sum of an element from each of the disjoint sets
  4. direct transmission a transmission mechanism in which the infectious agent is transferred directly into the body via touching or biting or kissing or sexual intercourse or by droplets entering the eye or nose or mouth
  5. direct mail advertising sent directly to prospective customers via the mail
  6. Tractarianism principles of the founders of the Oxford movement as expounded in pamphlets called `Tracts for the Times'
  7. direct primary a primary where voters directly select the candidates who will run for office
  8. directed study a course of study that is supervised and controlled by a specialist in the subject
  9. Diceros simus large light-grey African rhinoceros having two horns
  10. disassembly the act of taking something apart (as a piece of machinery)
  11. direct-grant school formerly a school that charged tuition fees and also received government grants in return for admitting certain non-paying students who were nominated by the local authorities
  12. rectorship the office or station of a rector
  13. structural steel a strong steel that is rolled into shapes that are used in construction
  14. characteristically in characteristic manner
  15. Thelypteris simulata delicate feathery shield fern of the eastern United States
  16. directory an alphabetical list of names and contact information
  17. distress signal an internationally recognized signal sent out by a ship or plane indicating that help is needed
  18. direct support a mission requiring one force to support another specific force and authorizing it to answer directly the supported force's request for assistance
  19. Richter scale a logarithmic scale of 1 to 10 formerly used to express the magnitude of an earthquake on the basis of the size of seismograph oscillations
  20. structuralism an anthropological theory that there are unobservable social structures that generate observable social phenomena

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