Etymology
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observation (n.)

late 14c., observacioun, "the performance of a religious rite," from Old French observation (c. 1200) and directly from Latin observationem (nominative observatio) "a watching over, observance, investigation," noun of action from past-participle stem of observare "watch over, note, heed, look to, attend to, guard, regard, comply with," from ob "in front of, before" (see ob-) + servare "to watch, keep safe," from PIE root *ser- (1) "to protect." Sense of "act or fact of paying attention" is from 1550s. Meaning "a remark in reference to something observed" is recorded from 1590s.

updated on July 26, 2019

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Definitions of observation from WordNet

observation (n.)
the act of making and recording a measurement;
observation (n.)
the act of observing; taking a patient look;
Synonyms: observance / watching
observation (n.)
a remark expressing careful consideration;
Synonyms: reflection / reflexion
observation (n.)
facts learned by observing;
he reported his observations to the mayor
observation (n.)
the act of noticing or paying attention;
Synonyms: notice / observance
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.