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observatory

noun

ob·​ser·​va·​to·​ry əb-ˈzər-və-ˌtȯr-ē How to pronounce observatory (audio)
plural observatories
Synonyms of observatorynext
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.
One of these, Lazuli, will be the first private space observatory in history. Chris Young, Interesting Engineering, 14 Jan. 2026 Makes sense, as the rotunda dome does look a lot like an observatory. Sal Pizarro, Mercury News, 13 Jan. 2026 Under Grossfeld's careful direction this humble little observatory was eventually named the first International Dark Sky Place in Oregon in 2020. Jeff Spry, Space.com, 11 Jan. 2026 Located on a mountaintop in Chile, the observatory will repeatedly scan the sky for 10 years using the 3,200 megapixel LSST Camera to create an ultra-wide, ultra-high-definition time-lapse record of our universe. Laura Baisas, Popular Science, 8 Jan. 2026 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

Browse Nearby Words

Cite this Entry

“Observatory.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/observatory. Accessed 20 Jan. 2026.

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

Last Updated: - Updated example sentences
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