astronomical
Americanadjective
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of, relating to, or connected with astronomy.
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extremely large; exceedingly great; enormous.
It takes an astronomical amount of money to build a car factory.
adjective
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enormously large; immense
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of or relating to astronomy
Other Word Forms
Derived Forms
Etymology
Origin of astronomical
First recorded in 1550–60; from Latin astronomic(us) (from Greek astronomikós ) + -al 1; see astronomy, -ic
Explanation
If you lie down on a big field or on a rooftop and look up, the sky is so wide and high, it is astronomical in size — bigger than huge. Everything in that sky, including the stars and planets, is also astronomical because it is part of a science called astronomy. Astra and aster are the Latin and Greek words for star, and the first four letters of astronomical, a-s-t-r, are a scramble of the word star. Astronomy includes the study of stars, but planets and other objects and happenings in space are also part of astronomical studies. Considering how large everything in space is, it makes sense that very, very large or uncountable things sometimes get the description astronomical.
Vocabulary lists containing astronomical
Eclipse Vocabulary
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From Ascension to Zenith: Astronomy and Stargazing Terms
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Elements of the Universe: Aster, Astro ("Star")
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Its satellites have been blamed for interfering with astronomical observations and posing an ever-increasing risk of space collisions.
From Los Angeles Times • Jun. 9, 2026
In the Northern Hemisphere, the June solstice marks the official beginning of astronomical summer.
From Science Daily • Jun. 3, 2026
She explained that breweries are facing rising costs, from business rates to "astronomical" fuel prices, but the consumer doesn't expect their beer to go up in price.
From BBC • May 25, 2026
Early investors often have astronomical gains on paper—SpaceX, for instance, was worth a measly $30.5 billion in 2018—but selling shares on the secondary market can get clunky.
From Barron's • May 22, 2026
However, the existence of dark matter is widely accepted because it explains the discrepancies found between the mass of large astronomical objects and their gravitational effect.
From "We Are the Ants" by Shaun David Hutchinson
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
