Vine's Expository Dictionary of NT Words
"attentive watching" (akin to paratereo, "to observe"), is used in Luke 17:20 , of the manner in which the kingdom of God (i.e., the operation of the spiritual kingdom in the hearts of men) does not come, "in such a manner that it can be watched with the eyes" (Grimm-Thayer), or, as AV marg., "with outward show."
"to observe carefully, consider well" (ana, "up," intensive, and theoreo, "to behold"), is used in Acts 17:23 , RV, "observed" (of Paul's notice of the objects of Athenian worship), and Hebrews 13:7 , "considering." See BEHOLD.
see KEEP , No. 1.
see KEEP , No. 3.
"to watch closely, observe narrowly" (para, used intensively, and No. 2), is translated "ye observe" in Galatians 4:10 , where the Middle Voice suggests that their religious observance of days, etc. was not from disinterested motives, but with a view to their own advantage. See WATCH. Cp. phroneo ("to think"), "regardeth" in Romans 14:6 , where the subject is connected with the above, though the motive differs.
see KEEP , No. 4.
"to do," is translated "to observe" in Acts 16:21 . See DO.
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Vines, W. E., M. A. Entry for 'Observation, Observe'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/o/observation-observe.html. 1940.