gigayear.
A billion years: a thousand million years, that is, a thousand thousand thousand years.
Meaning & usage
A billion years: a thousand million years, that is, a thousand thousand thousand years.
Where this word comes from
Etymology tree Ancient Greek Γίγας (Gígas) Ancient Greek γίγας (gígas)der. English giga- Proto-Indo-European *(H)yeh₁-der.? Proto-Indo-European *yóh₁r̥der. Proto-Germanic *jērą Proto-West Germanic *jār Old English ġēar Middle English yeer English year English gigayear From giga- + year.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.