astronomical
adjective
as·tro·nom·i·cal
ˌa-strə-ˈnä-mi-kəl 
variants
or less commonly astronomic
1
: of or relating to astronomy
astronomical observations
2
: enormously or inconceivably large or great
astronomical numbers
an astronomical price
Synonyms of astronomical
Examples of astronomical in a Sentence
The cost of the office building was astronomical.
We got an astronomical telephone bill this month.
Recent Examples on the Web
Mostly Mute Monday tells an astronomical story in images, visuals, and no more than 200 words.
—
Big Think, 6 Apr. 2026
During the final week of March, Venus began setting after the end of astronomical twilight, that is, in a completely dark sky, a circumstance that will persist until late August.
—Joe Rao, Space.com, 3 Apr. 2026
That altitude will eventually allow the astronauts to prepare Orion for a maneuver to raise the vehicle's perigee – an astronomical term referring to the point at which an object is nearest to Earth in its continuous orbit.
—Eric Lagatta, USA Today, 2 Apr. 2026
The ecclesiastical equinox is fixed on March 21, even though the astronomical equinox can fall on a different date, such as March 20 in 2026.
—Maria Azzurra Volpe, MSNBC Newsweek, 31 Mar. 2026
See All Example Sentences for astronomical
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Big Think, 6 Apr. 2026
During the final week of March, Venus began setting after the end of astronomical twilight, that is, in a completely dark sky, a circumstance that will persist until late August.
—Joe Rao, Space.com, 3 Apr. 2026
That altitude will eventually allow the astronauts to prepare Orion for a maneuver to raise the vehicle's perigee – an astronomical term referring to the point at which an object is nearest to Earth in its continuous orbit.
—Eric Lagatta, USA Today, 2 Apr. 2026
The ecclesiastical equinox is fixed on March 21, even though the astronomical equinox can fall on a different date, such as March 20 in 2026.
—Maria Azzurra Volpe, MSNBC Newsweek, 31 Mar. 2026
See All Example Sentences for astronomical
Cite this Entry
“Astronomical.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astronomical. Accessed 8 Apr. 2026.
Copy CitationKids Definition
astronomical
adjective
as·tro·nom·i·cal
ˌas-trə-ˈnäm-i-kəl
variants
also astronomic
1
: of or relating to astronomy
2
: extremely or unbelievably large
the cost was astronomical
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