1. conservation careful management of the environment and natural resources
  2. observation the act of taking a patient look
  3. radio observation an observation made with a radio telescope
  4. conservative resistant to change
  5. soil conservation protection of soil against erosion or deterioration
  6. oil conservation the conservation of petroleum resources
  7. preservation the activity of protecting something from loss or danger
  8. reservation the act of setting aside for some future occasion
  9. water conservation the conservation of water resources
  10. enervation lack of vitality
  11. in operation being in effect or operation
  12. self-preservation preservation of yourself from harm
  13. innovation the act of starting something for the first time
  14. mental reservation an unstated doubt that prevents you from accepting something wholeheartedly
  15. observational relying on observation or experiment
  16. innervation the neural or electrical arousal of an organ or muscle or gland
  17. Indian reservation a reservation set aside for the use of Indians
  18. commiseration feeling of sympathy and sorrow for the misfortunes of others
  19. conservationist someone who works to protect the environment
  20. deprivation the disadvantage that results from losing something