/ ˌæstrəˈnɒmɪkl; NAmE -ˈnɑːm-/ adjective
1.
connected with astronomy :
astronomical observations
2.
(also astro·nom·ic ) ( informal ) ( of an amount, a price, etc. ) very large :
the astronomical costs of land for building
The figures are astronomical.
► astro·nom·ic·al·ly / -kli; NAmE / adverb :
Interest rates are astronomically high.
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WORD ORIGIN
mid 16th cent.: via Latin from Greek astronomikos , from astronomia , from Greek , from astronomos (adjective) star-arranging.