Etymology
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astronomical (adj.)

1550s, "pertaining to astronomy," from astronomy + -ical. The 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 the Earth to the Sun," used as a unit of measure of distance in space, is from 1909. Related: Astronomically.

updated on September 24, 2022

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Definitions of astronomical from WordNet

astronomical (adj.)
relating or belonging to the science of astronomy;
Synonyms: astronomic
astronomical (adj.)
inconceivably large;
Synonyms: astronomic / galactic
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.