1. enervation lack of vitality
  2. observation the act of taking a patient look
  3. aggravation action that makes a problem or a disease worse
  4. innervation the neural or electrical arousal of an organ or muscle or gland
  5. reservation the act of setting aside for some future occasion
  6. abbreviation shortening something by omitting parts of it
  7. aestivation cessation or slowing of activity during the summer
  8. estivation cessation or slowing of activity during the summer
  9. usurpation wrongfully seizing and holding by force
  10. assertion a declaration that is made emphatically
  11. aberration a state or condition markedly different from the norm
  12. activation causing something to take effect or to have energy
  13. laceration the act of tearing irregularly
  14. maceration extreme leanness (usually caused by starvation or disease)
  15. incurvation a shape that curves or bends inward
  16. aeration the process of exposing to air (so as to purify)
  17. conservation careful management of the environment and natural resources
  18. preservation the activity of protecting something from loss or danger
  19. derivation the source or origin from which something comes
  20. starvation a state of extreme hunger

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