What does astronomic mean?
Astronomic is an adjective with two closely connected uses. In its literal sense, it describes anything pertaining to astronomy — the science of stars, planets, and other celestial objects — as in 'astronomic observation' or 'astronomic research'. More commonly in everyday speech, however, it functions as a vivid intensifier meaning enormous beyond ordinary measure, typically applied to figures and quantities: astronomic costs, astronomic rents, or an astronomic rise in demand. The word derives from Greek roots meaning 'star' and 'law' or 'arrangement', reflecting its scientific origin, before extending metaphorically to any scale comparable to that of the universe. It exists largely as a less frequent variant of the much more common adjective 'astronomical', which most dictionaries treat as interchangeable. Writers who reach for astronomic usually want to convey not just bigness but a sense of awe or disbelief at the sheer size of what they describe.
Relating to astronomy or celestial objects and phenomena.
"The conference covered advances in astronomic instrumentation over the past century."
Extremely large in amount, degree, or extent; enormous.
"The company reported astronomic losses for the third consecutive quarter."
This figurative sense is a variant of the more common 'astronomical'; some style guides prefer 'astronomical' in general writing.
When prices get so high they defy belief, English borrows a word from the stars: something 'astronomic' is literally priced like the heavens.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of astronomic
Astronomic comes from the Greek 'astronomia', formed from 'astron' (star) and 'nomos' (law or arrangement), literally 'the law or arrangement of the stars'. The word entered English by way of Latin 'astronomicus' during the Renaissance period, when European scholars were reviving classical astronomical learning. It shares this Greek root with related terms such as astronaut, asterisk, and even disaster (literally 'bad star'), all descendants of the ancient idea that the stars governed earthly affairs.
Related word forms
How astronomic is actually used
'Astronomic' is considerably less common than its variant 'astronomical', which dominates both literal and figurative usage. In figurative use it carries no inherent positive or negative connotation — it simply conveys scale so large as to be hard to comprehend, often with a hint of shock when applied to money or growth.
Easily confused with astronomic
Astronomical and astronomic are essentially interchangeable variants, but astronomical is far more common; 'astronomic' more often refers strictly to matters of astronomy itself.
Economic relates to economics or financial efficiency, whereas astronomic means either relating to astronomy or simply vast in size — the words merely rhyme, not overlap.