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Observatory

Definition: A place or building for making observations on the
heavenly bodies.

Observatory

Definition: A building fitted with instruments for making
systematic observations of any particular class or series of natural
phenomena.

Observatory

Definition: A place, as an elevated chamber, from which a view may
be observed or commanded.

Observatory

Definition: A lookout on a flank of a battery whence an officer
can note the range and effect of the fire.