as·tro·nom·i·cal

[as-truh-nom-i-kuhl]
adjective
1.
of, pertaining to, or connected with astronomy.
2.
extremely large; exceedingly great; enormous: It takes an astronomical amount of money to build a car factory.
Also, as·tro·nom·ic.


Origin:
1550–60; < Latin astronomic(us) (< Greek astronomikós; see astronomy, -ic) + -al1

as·tro·nom·i·cal·ly, adverb
non·as·tro·nom·ic, adjective
non·as·tro·nom·i·cal, adjective
non·as·tro·nom·i·cal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To astronomical
00:10
Astronomical is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
astronomical or astronomic (ˌæstrəˈnɒmɪkəl) [Click for IPA pronunciation guide]
 
adj
1.  enormously large; immense
2.  of or relating to astronomy
 
astronomic or astronomic
 
adj
 
astro'nomically or astronomic
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

astronomical
1550s, adj. from astronomy + -ical. Popular meaning "immense, concerning very large figures" (as sizes and distances in astronomy) is attested from 1899. Astronomical unit (abbrev. A.U.) "mean distance from Earth to Sun," used as a unit of measure of distance in space, is from 1909.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
As the pace of astronomical discovery grew, so did the job.
Today her works fetch astronomical prices at auction.
Scientists suspect that it could be a dim failed star or a type of astronomical
  object that has never been observed before.
Now that you know the basics of the seasons, see if you can identify the four
  days of the astronomical calendar on our cosmic map.
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