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
- Brobdingnagian
- bumper
- colossal
- cosmic
- cosmical
- cyclopean
- elephantine
- enormous
- galactic
- gargantuan
- giant
- gigantesque
- gigantic
- grand
- herculean
- heroic
- heroical
- Himalayan
- huge
- humongous
- humungous
- immense
- jumbo
- king-size
- king-sized
- leviathan
- mammoth
- massive
- mega
- mighty
- monster
- monstrous
- monumental
- mountainous
- oceanic
- pharaonic
- planetary
- prodigious
- super
- super-duper
- supersize
- supersized
- titanic
- tremendous
- vast
- vasty
- walloping
- whacking
- whopping
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
Upcoming celestial events This year, the December full moon occurs one week before the winter solstice, an astronomical event caused by the Earth’s tilt, that marks the Northern Hemisphere’s longest night and shortest day and vice versa for the Southern Hemisphere.
—
Taylor Nicioli, CNN, 14 Dec. 2024
Here's a list of the 2025 astronomical events to put on your viewing calendar this year:
Meteor showers that will be visible in 2025:
Meteor showers are caused by debris entering the Earth's atmosphere at 35 kilometers per second, according to NASA.
—Alex Groth, Journal Sentinel, 13 Dec. 2024
Just a few miles from ALMA is the University of Tokyo Atacama Observatory, the world’s highest astronomical observatory at 5,640 meters atop Cerro Chajnantor in Chile, which opened in May.
—Jamie Carter, Forbes, 13 Dec. 2024
The organization keeps track of meteor sightings and your report can help alert and inform scientists about important astronomical events.
—John Tufts, The Indianapolis Star, 10 Dec. 2024
See all Example Sentences for astronomical 
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Taylor Nicioli, CNN, 14 Dec. 2024
Here's a list of the 2025 astronomical events to put on your viewing calendar this year:
Meteor showers that will be visible in 2025:
Meteor showers are caused by debris entering the Earth's atmosphere at 35 kilometers per second, according to NASA.
—Alex Groth, Journal Sentinel, 13 Dec. 2024
Just a few miles from ALMA is the University of Tokyo Atacama Observatory, the world’s highest astronomical observatory at 5,640 meters atop Cerro Chajnantor in Chile, which opened in May.
—Jamie Carter, Forbes, 13 Dec. 2024
The organization keeps track of meteor sightings and your report can help alert and inform scientists about important astronomical events.
—John Tufts, The Indianapolis Star, 10 Dec. 2024
See all Example Sentences for astronomical
Articles Related to astronomical
Dictionary Entries Near astronomical
Cite this Entry
“Astronomical.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astronomical. Accessed 22 Dec. 2024.
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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