as·​tro·​nom·​i·​cal | \ ˌas-trə-ˈnä-mi-kəl How to pronounce astronomical (audio) \
variants: or less commonly astronomic \ -​mik How to pronounce astronomic (audio) \

Definition of astronomical

1 : of or relating to astronomy astronomical observations
2 : enormously or inconceivably large or great astronomical numbers an astronomical price

Keep scrolling for more

Other Words from astronomical

astronomically \ -​mi-​k(ə-​)lē How to pronounce astronomically (audio) \ 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

Even if Overseas Elite is the best team, the odds of going 25-0 in a single-elimination tournament with little scouting or preparation are astronomical — especially when 16 of those wins came by 10 points or fewer. Dan Wolken, USA TODAY, "Will Overseas Elite win a fifth consecutive TBT? That's the $2 million question," 18 July 2019 When UConn went far down the Big East road a couple of years ago, the sticking points were astronomical entry and exit fees. Mike Anthony,, "Mike Anthony: UConn women’s basketball better off in the Big East, even if the program never struggled in six years without it," 25 June 2019 But back in 1900, people couldn't just fire up YouTube to catch a glimpse of the astronomical phenomenon. Daisy Hernandez, Popular Mechanics, "See the Oldest Known Footage of a Solar Eclipse," 3 June 2019 Destinations near and north of the Arctic Circle experience an astronomical phenomenon: the midnight sun. Valerie Stimac, National Geographic, "Magical places to experience the midnight sun this summer," 22 May 2019 The summer solstice is an annual astronomical phenomenon that brings the longest day of the year and the first day of summer in the Northern Hemisphere (and the shortest night). Tom Metcalfe, NBC News, "What is the summer solstice? The science behind the first day of summer," 20 June 2018 Long seen as signifying growth and life, the astronomical event has an ancient history of being recognized as a special event in the calendar. National Geographic, "Summer solstice traditions from around the world," 20 June 2019 South Florida area codes consistently receive astronomical numbers of these fraudulent calls each year. Doreen Christensen,, "What cell carriers plan to do to aggressively block robocalls after FCC ruling," 7 June 2019 There’s also reason to be skeptical of these astronomical numbers. Jon Porter, The Verge, "Alibaba’s Singles Day sales dwarf Amazon’s biggest day," 12 Nov. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'astronomical.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of astronomical

1551, in the meaning defined at sense 1

History and Etymology for astronomical

see astronomy

Keep scrolling for more

Learn More about astronomical

Statistics for astronomical

Last Updated

21 Jul 2019

Look-up Popularity

Time Traveler for astronomical

The first known use of astronomical was in 1551

See more words from the same year

Keep scrolling for more

More Definitions for astronomical



English Language Learners Definition of astronomical

: of or relating to astronomy
: extremely large


as·​tro·​nom·​i·​cal | \ ˌa-strə-ˈnä-mi-kəl How to pronounce astronomical (audio) \
variants: or astronomic \ -​ik \

Kids Definition of astronomical

1 : of or relating to astronomy astronomical research
2 : extremely or unbelievably large The cost was astronomical.

Other Words from astronomical

astronomically adverb an astronomically large amount

Keep scrolling for more

Comments on astronomical

What made you want to look up astronomical? Please tell us where you read or heard it (including the quote, if possible).


something desired as essential

Get Word of the Day daily email!

Test Your Vocabulary

What's that Smell?! Quiz

  • wide eyed dog smelling rose
  • Someone who is hircine smells like a:
True or False

Test your knowledge - and maybe learn something along the way.

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!