1. extremely low frequency below 3 kilohertz
  2. extreme unction a Catholic sacrament
  3. extremely high frequency 30 to 300 gigahertz
  4. extralinguistic not included within the realm of language
  5. extraneous not belonging to that in which it is contained
  6. instrumental conditioning operant conditioning that pairs a response with a reinforcement in discrete trials; reinforcement occurs only after the response is given
  7. extreme point the point located farthest from the middle of something
  8. extremely to the greatest possible degree
  9. stream of consciousness the continuous flow of ideas and feelings that constitute an individual's conscious experience
  10. extrinsic not forming an essential part of a thing
  11. Augsburg Confession the document drawn up in 1555 to defend the catholicity of Lutheran doctrine and to justify innovations in Lutheran practice; is still in effect today
  12. extremeness the quality of being extreme
  13. mental confusion a mental state characterized by a lack of clear and orderly thought and behavior
  14. external-combustion engine a heat engine in which ignition occurs outside the chamber (cylinder or turbine) in which heat is converted to mechanical energy
  15. external orifice the orifice through which urine is discharged
  16. extermination the act of getting rid of by killing off
  17. in great confusion in disorderly haste
  18. extragalactic outside or beyond a galaxy
  19. extraneousness unrelatedness by virtue of falling outside the matter at hand
  20. extreme right-winger an extreme conservative