WordReference Random House Learner's Dictionary of American English © 2017
as•tro•nom•i•cal /ˌæstrəˈnɑmɪkəl/USA pronunciation  also ˌas•troˈnom•ic, adj. 
  1. Astronomy[usually: before a noun] of, relating to, or connected with astronomy.
  2. huge:astronomical debts.
as•tro•nom•i•cal•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2017
as•tro•nom•i•cal  (as′trə nomi kəl),USA pronunciation adj. 
  1. Astronomyof, 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•nomic. 
as′tro•nomi•cal•ly, adv. 
  • Greek astronomikós; see astronomy, -ic) + -al1
  • Latin astronomic(us) (
  • 1550–60

Collins Concise English Dictionary © HarperCollins Publishers::

astronomical /ˌæstrəˈnɒmɪkəl/, astronomic adj
  1. enormously large; immense
  2. of or relating to astronomy

ˌastroˈnomically adv

'astronomical' also found in these entries:

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