astronomical

[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, astronomic.


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

astronomically, adverb
nonastronomic, adjective
nonastronomical, adjective
nonastronomically, adverb
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World English Dictionary
astronomical or astronomic (ˌæstrəˈnɒmɪkəl)
 
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
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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
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Example sentences
Unraveling an astronomical mystery and a presidency.
The world's oldest astronomical calculator is famous for having intricate gear
  systems centuries ahead of their time.
As the pace of astronomical discovery grew, so did the job.
Some ridiculous pedants on here discussing spelling instead of this wonderful
  astronomical event.
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