1. one thousand the cardinal number that is the product of 10 and 100
  2. one-thousandth one part in a thousand equal parts
  3. ten thousand the cardinal number that is the product of ten and one thousand
  4. ten-thousandth one part in ten thousand equal parts
  5. anthozoan sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed
  6. one-ten-thousandth one part in ten thousand equal parts
  7. on the one hand from one point of view
  8. on-the-scene at the scene of action
  9. on the side without official authorization
  10. on-the-spot at the scene of action
  11. on the spot at the place in question; there
  12. thousand the cardinal number that is the product of 10 and 100
  13. enthusiast an ardent supporter of some person or activity
  14. analysand a person undergoing psychoanalysis
  15. untoasted not having been browned by exposure to heat
  16. entozoan any of various parasites that live in the internal organs of animals (especially intestinal worms)
  17. undesigned not done or made or performed with purpose or intent
  18. indecent not in keeping with accepted standards of polite society
  19. en passant (chess) a chess pawn that is moved two squares can be captured by an opponent's pawn commanding the square that was passed
  20. incessant uninterrupted in time and indefinitely long continuing

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.