Astronomical | Definition of astronomical by Merriam-Webster

Full Definition of ASTRONOMICAL

1

: of or relating to astronomy <astronomical observations>

2

: enormously or inconceivably large or great <astronomical numbers>

— as·tro·nom·i·cal·ly \-mi-k(ə-)lē\ adverb

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as·tro·nom·i·cal also as·tro·nom·ic \-mik\

1556

Synonyms: huge (also astronomic), Brobdingnagian, bumper, colossal, cosmic (also cosmical), cyclopean, elephantine, enormous, galactic, gargantuan, giant, gigantesque, gigantic, grand, herculean, heroic (also heroical), Himalayan, humongous (also humungous), immense, jumbo, king-size (or king-sized), leviathan, mammoth, massive, mega, mighty, monster, monstrous, monumental, mountainous, oceanic, pharaonic, planetary, prodigious, super, super-duper, supersize, supersized, titanic, tremendous, vast, vasty, walloping, whacking, whopping

Antonyms: bantam, bitty, diminutive, infinitesimal, Lilliputian, little bitty, micro, microminiature, microscopic (also microscopical), midget, miniature, minuscule, minute, pocket, pygmy, teensy, teensy-weensy, teeny, teeny-weeny, tiny, wee

1

: of or relating to astronomy <astronomical research>

2

: extremely or unbelievably large <The cost was astronomical.>

— as·tro·nom·i·cal·ly adverb <an astronomically large amount>

as·tro·nom·i·cal or as·tro·nom·ic \-ik\

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