observatory

noun

ob·​ser·​va·​to·​ry əb-ˈzər-və-ˌtȯr-ē How to pronounce observatory (audio)
plural observatories
1
: a building or place given over to or equipped for observation of natural phenomena (as in astronomy)
also : an institution whose primary purpose is making such observations
2
: a situation or structure commanding a wide view

Examples of observatory in a Sentence

the observatory is located on a mountaintop
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The range of wavelengths your observatory is sensitive to. Big Think, 20 Mar. 2025 If approved, China’s ambitious project could be the first operational lunar radio observatory. Mrigakshi Dixit, Interesting Engineering, 20 Mar. 2025 Well, on March 7, 2023, two NASA observatories — Swift and Fermi — detected a long-period gamma-ray burst that endured for about 200 seconds, definitively in the long-period class. Big Think, 20 Mar. 2025 The observatory cautioned residents to stay indoors and to wear masks outside if ash is present. Minyvonne Burke, NBC News, 20 Mar. 2025 See All Example Sentences for observatory

Word History

Etymology

borrowed from New Latin observātōrium "place for observing celestial phenomena," from Latin observāre "to give attention, watch carefully, observe" + -tōrium, suffix of place, noun derivative from neuter of -tōrius, deverbal adjective suffix originally forming derivatives from agent nouns ending in -tōr-, -tor

First Known Use

1673, in the meaning defined at sense 1

Time Traveler
The first known use of observatory was in 1673

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Cite this Entry

“Observatory.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/observatory. Accessed 19 Apr. 2025.

Kids Definition

observatory

noun
ob·​ser·​va·​to·​ry əb-ˈzər-və-ˌtōr-ē How to pronounce observatory (audio)
-ˌtȯr-
plural observatories
1
: a place or institution equipped with instruments for observation of natural objects and events (as in astronomy)
2
: a place providing a wide view

More from Merriam-Webster on observatory

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