1. ionisation the process of ionizing
  2. incision the cutting of or into body tissues or organs
  3. ionization the process of ionizing
  4. ingestion the process of taking food into the body through the mouth
  5. intuition instinctive knowing, without the use of rational processes
  6. inaction the state of being inactive
  7. infusion the act of introducing a modifying element or quality
  8. in question open to doubt or suspicion
  9. insulation reduction of the transmission of sound, heat, or electricity
  10. inception an event that is a beginning
  11. insertion the act of putting one thing into another
  12. inhumation the ritual placing of a corpse in a grave
  13. inanition exhaustion resulting from lack of food
  14. incaution the trait of forgetting or ignoring possible danger
  15. ignition the process of initiating combustion or catching fire
  16. invasion any entry into an area not previously occupied
  17. junction an act of joining or adjoining things
  18. incitation an act of urging on or spurring on or rousing to action or instigating
  19. insolation incident solar radiation
  20. enation a natural projection or outgrowth from a plant body or organ

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