(n.) A place or building for making observations on the heavenly bodies.
(n.) A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena.
(n.) A place, as an elevated chamber, from which a view may be observed or commanded.
(n.) A lookout on a flank of a battery whence an officer can note the range and effect of the fire.
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Webster, Noah. Entry for 'Observatory'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/o/observatory.html. 1828.