Pronunciation: (ob"zûr-vā'shun),[key] —n. 1. an act or instance of noticing or perceiving.
2. an act or instance of regarding attentively or watching.
3. the faculty or habit of observing or noticing.
4. notice: to escape a person's observation. 5. an act or instance of viewing or noting a fact or occurrence for some scientific or other special purpose: the observation of blood pressure under stress. 6. the information or record secured by such an act.
7. something that is learned in the course of observing things: My observation is that such clouds mean a storm. 8. a remark, comment, or statement based on what one has noticed or observed.
9. the condition of being observed.
10. Navig. a. the measurement of the altitude or azimuth of a heavenly body for navigational purposes.
b. the information obtained by such a measurement.
11. Obs.observance, as of the law.