astronomical

adjective

as·​tro·​nom·​i·​cal ˌa-strə-ˈnä-mi-kəl How to pronounce astronomical (audio)
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
astronomically adverb

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
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.
But the two have racked up an astronomical, nine-figure legal bill that far exceeds any reasonable amount the two may have needed for their defense, the bank said in a court filing late Friday. Ken Sweet, Fortune, 25 Oct. 2025 The bank said in a court filing Friday that Charlie Javice and Olivier Amar have racked up an astronomical $115 million legal bill. Boston Herald Wire Services, Boston Herald, 25 Oct. 2025 The astronomical energy demand for data centers has raised environmental concerns about AI as tech companies draw more electricity and drive up emissions from fossil fuel generation. Jeff Young, MSNBC Newsweek, 24 Oct. 2025 Dark matter has never been directly detected, but the astronomical evidence for its existence is overwhelming. Big Think, 23 Oct. 2025 See All Example Sentences for astronomical

Word History

Etymology

Late Latin astronomicus "of or relating to astronomy" (borrowed from Greek astronomikós "of astronomy, skilled in astronomy," from astronomía astronomy + -ikos -ic entry 1) + -al entry 1

First Known Use

1551, in the meaning defined at sense 1

Time Traveler
The first known use of astronomical was in 1551

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Cite this Entry

“Astronomical.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astronomical. Accessed 29 Oct. 2025.

Kids Definition

astronomical

adjective
as·​tro·​nom·​i·​cal ˌas-trə-ˈnäm-i-kəl How to pronounce astronomical (audio)
variants also astronomic
1
: of or relating to astronomy
2
: extremely or unbelievably large
the cost was astronomical
astronomically adverb

More from Merriam-Webster on astronomical

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