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obsequious
observable
observably
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observatory

ob·ser·va·to·ry [ əb zúrvə tàwree ] (plural ob·ser·va·to·ries)


noun 
Definition:
 
1. place for scientific observations: a building, station, or artificial satellite used for scientific observation of natural phenomena such as astronomical objects, the weather, or earthquakes

2. place for looking at view: a place or building that commands an expansive view

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