noun, noun which may take the genitive case particle 'no'
Literary term meaning something so rare or remarkable that it has no precedent in history. Often used in formal or written contexts to describe events, achievements, or discoveries.
これは曠古の大発見だ。
This is an unprecedented great discovery.
曠古の偉業を成し遂げた。
They achieved a historic feat.
Compound of 曠 (vast, empty, rare) and 古 (old, ancient), literally 'vast antiquity'. The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning 'unprecedented in history'.