Definition of observatory noun from the Oxford Advanced Learner's Dictionary



BrE BrE//əbˈzɜːvətri//
; NAmE NAmE//əbˈzɜːrvətɔːri//
(pl. observatories) Buildings
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a special building from which scientists watch the stars, the weather, etc. See related entries: Buildings Word Originlate 17th cent.; from modern Latin observatorium, from Latin observat- ‘watched’, from the verb observare ‘to watch’, from ob- ‘towards’ + servare ‘attend to, look at’.
See the Oxford Advanced American Dictionary entry: observatory