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
From the northern hemisphere, the planets will be low on the eastern horizon in the early morning hours before astronomical dawn.
—
Jamie Carter,
Space.com,
3 July 2026
To compliment the sights, NASA also produced new sonifications—a method to transform astronomical information into often ethereal soundscapes.
—
Andrew Paul,
Popular Science,
2 July 2026
For those who appreciate dark skies, the only thing better than a dark-sky park is a dark-sky campsite, where fans can stay overnight to savor starry skies and astronomical wonders.
—
Jeffrey Steele,
Forbes.com,
29 June 2026
True to its name, Swift is designed to pivot quickly to capture late-breaking astronomical events such as gamma ray bursts and exploding stars.
—
Marcia Dunn,
Fortune,
28 June 2026
See All Example Sentences for astronomical
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Jamie Carter,
Space.com,
3 July 2026
To compliment the sights, NASA also produced new sonifications—a method to transform astronomical information into often ethereal soundscapes.
—
Andrew Paul,
Popular Science,
2 July 2026
For those who appreciate dark skies, the only thing better than a dark-sky park is a dark-sky campsite, where fans can stay overnight to savor starry skies and astronomical wonders.
—
Jeffrey Steele,
Forbes.com,
29 June 2026
True to its name, Swift is designed to pivot quickly to capture late-breaking astronomical events such as gamma ray bursts and exploding stars.
—
Marcia Dunn,
Fortune,
28 June 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 5 Jul. 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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