1. observation tower a structure commanding a wide view of its surroundings
  2. observation dome lookout consisting of a dome-shaped observatory
  3. observational relying on observation or experiment
  4. observation the act of taking a patient look
  5. observation post an elevated post affording a wide view
  6. observation station a station set up for making observations of something
  7. observantly in an observant manner
  8. observatory a building equipped to view astronomical phenomena
  9. observant quick to notice; showing quick and keen perception
  10. absorption factor (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body
  11. conservation of matter a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system
  12. observance conformity with law, custom, or practice
  13. association theory (psychology) a theory that association is the basic principle of mental activity
  14. information theory (computer science) a statistical theory dealing with the limits and efficiency of information processing
  15. observingly in an observant manner
  16. absorbefacient inducing or promoting absorption
  17. observing quick to notice; showing quick and keen perception
  18. observer a person who becomes aware through the senses
  19. absorption unit a unit for measuring absorption
  20. observed fire fire for which the point of impact (the burst) can be seen by an observer; fire can be adjusted on the basis of the observations

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