observatory

American  

[uhb-zur-vuh-tawr-ee, -tohr-ee] / əbˈzɜr vəˌtɔr i, -ˌtoʊr i /

noun

plural

observatories

1. a place or building equipped and used for making observations of astronomical, meteorological, or other natural phenomena, especially a place equipped with a powerful telescope for observing the planets and stars.

2. an institution that controls or carries on the work of such a place.

3. a place or structure that provides an extensive view; lookout.

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observatory British  

/ -trɪ, əbˈzɜːvətərɪ /

noun

1. an institution or building specially designed and equipped for observing meteorological and astronomical phenomena

2. any building or structure providing an extensive view of its surroundings

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Etymology

Origin of observatory

1670–80; < Latin observā ( re ) to observe + -tory ²

Explanation

An observatory is a structure that holds a large telescope for observing the stars and planets or some celestial event. If you want to check out a lunar eclipse, then head to your nearest observatory. Observatories for examining the distant sky are typically located far from large cities, since light pollution makes it more difficult to see celestial bodies like stars and planets, or events like meteor showers. Another kind of observatory is quite simply a very tall, often skinny building meant for looking down over a city or its coastline. Observatory comes from the verb observe, or "watch," which in turn is rooted in the Latin observare, "watch over or guard."

Example Sentences

It is the latest step in the mission to replace the old observatory which has taken more than four-and-a-half years.

From BBC • Mar. 3, 2026

While shooting her previous feature in Chile, McAlpine noticed donkeys hanging out around an observatory.

From Los Angeles Times • Feb. 23, 2026

The record snowfall was "caused by deep and extensive cyclones with sharp atmospheric fronts passing over the Moscow region", the observatory said.

From Barron's • Jan. 29, 2026

The observatory found that 78% intend to flee the island.

From The Wall Street Journal • Dec. 21, 2025

The fire observatory was on the side visible to him, and at last he knew where he was.

From "Abel's Island" by William Steig