1. extraordinary highly unusual or exceptional or remarkable
  2. extraordinaire extraordinary in a particular capacity
  3. extraordinarily extremely
  4. extrasensory seemingly outside normal sensory channels
  5. extradition surrender of an accused by one state or country to another
  6. extradite hand over to the authorities of another country
  7. extortioner a criminal who extorts money from someone by threatening to expose embarrassing information about them
  8. extraordinariness the quality of being extraordinary and not commonly encountered
  9. extraneous not belonging to that in which it is contained
  10. extradural on or outside the dura mater
  11. envoy extraordinary a diplomat having less authority than an ambassador
  12. exterminate kill on a large scale
  13. extravagant recklessly wasteful
  14. extrapolate draw from specific cases for more general cases
  15. extractor a mechanism in a firearm that pulls an empty shell case out of the chamber and passes it to the ejector
  16. extra point in American football a point awarded for a successful place kick following a touchdown
  17. extravagancy the quality of exceeding the appropriate limits of decorum or probability or truth
  18. extrovert a person directed toward others as opposed to the self
  19. exterminator someone who exterminates
  20. extra time playing time beyond regulation, to break a tie