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The Collaborative International Dictionary of English v.0.48 (gcide)

Observatory \Ob*serv"a*to*ry\, n.; pl. {Observatories}. [Cf. F.
observatoire.]
1. A place or building for making observations on the
heavenly bodies.
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The new observatory in Greenwich Park. --Evelyn.
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2. A building fitted with instruments for making systematic
observations of any particular class or series of natural
phenomena.
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3. A place, as an elevated chamber, from which a view may be
observed or commanded.
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4. (Mil.) A lookout on a flank of a battery whence an officer
can note the range and effect of the fire; usually
referred to as an {observation post}. --Farrow.
[1913 Webster PJC]