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.
Guests can see the observatory’s 200-inch Hale Telescope and take tours of its museum and facility. Carlos Rico, San Diego Union-Tribune, 8 Apr. 2026 To be of much use to radio astronomers, any spaceborne observatory would need to be exquisitely sensitive—so sensitive, in fact, that its observations would be inevitably swamped by telecommunications emanating from Earth. Joseph Howlett, Scientific American, 8 Apr. 2026 Most of the new discoveries are main-belt asteroids, but the observatory has also identified 33 previously unknown near-Earth objects (NEOs) — asteroids and comets whose orbits bring them close to the sun and are, therefore, of particular interest for planetary defense. Samantha Mathewson, Space.com, 5 Apr. 2026 Up on 71, there was that observatory, and by the elevators a vitrine held Chrysler’s toolbox, evidence of his beginnings as a railroad mechanic. Christopher Bonanos, Curbed, 27 Mar. 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 11 Apr. 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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster