Observation

[ob-zur-vey-shuh n] /ˌɒb zɜrˈveɪ ʃən/

noun
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.
Navigation.

11.
Obsolete. observance, as of the law.
/ˌɒbzəˈveɪʃən/
noun
1.
the act of observing or the state of being observed
2.
a comment or remark
3.
detailed examination of phenomena prior to analysis, diagnosis, or interpretation: the patient was under observation
4.
the facts learned from observing
5.
an obsolete word for observance
6.
(nautical)

n.

late 14c., “performance of a religious rite,” from Latin observationem (nominative observatio) “a watching over, observance, investigation,” noun of action from past participle stem of observare (see observe). Sense of “act or fact of paying attention” is from 1550s. Meaning “a remark in reference to something observed” first recorded 1590s.