1. extension ladder a ladder whose length can be extended
  2. extension cord an electric cord used to extend the length of a power cord
  3. extensional defining a word by listing the class of entities to which the word correctly applies
  4. extension agent an advisor employed by the government to assist people in rural areas with methods of farming and home economics
  5. extension phone an additional telephone set that is connected to the same telephone line
  6. extension course a course offered as part of an extension service
  7. accommodation ladder (nautical) a portable ladder hung over the side of a vessel to give access to small boats alongside
  8. extensible capable of being protruded or stretched or opened out
  9. extensile capable of being protruded or stretched or opened out
  10. extension act of expanding in scope
  11. extended order a military formation for skirmishing
  12. exterminator someone who exterminates
  13. extortionate greatly exceeding bounds of reason or moderation
  14. extensively in a widespread way
  15. extortioner a criminal who extorts money from someone by threatening to expose embarrassing information about them
  16. extension service an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
  17. extensor a skeletal muscle whose contraction extends or stretches a body part
  18. expansion bolt a bolt that has an attachment that expands as the bolt is driven into a surface
  19. expansion slot (computer) a socket in a microcomputer that will accept a plug-in circuit board
  20. extortionately to an exorbitant degree

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