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astronomical

or as·tro·nom·ic

[as-truh-nom-i-kuh l or as-truh-nom-ik]
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adjective
  1. of, relating to, or connected with astronomy.
  2. extremely large; exceedingly great; enormous: It takes an astronomical amount of money to build a car factory.
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Origin of astronomical

1550–60; < Latin astronomic(us) (< Greek astronomikós; see astronomy, -ic) + -al1
Related formsas·tro·nom·i·cal·ly, adverbnon·as·tro·nom·ic, adjectivenon·as·tro·nom·i·cal, adjectivenon·as·tro·nom·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for astronomically

astronomical

astronomic

adjective
  1. enormously large; immense
  2. of or relating to astronomy
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Derived Formsastronomically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for astronomically

astronomical

adj.

1550s, from astronomy + -ical. Popular meaning "immense, concerning very large figures" (as sizes and distances in astronomy) is attested from 1899. Astronomical unit (abbreviation A.U.) "mean distance from Earth to Sun," used as a unit of measure of distance in space, is from 1909. Related: Astronomically.

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Online Etymology Dictionary, © 2010 Douglas Harper