bya.
Abbreviation of billion years ago (A symbol for a unit of measure.)
Meaning & usage
Abbreviation of billion years ago (A symbol for a unit of measure.) Synonym of Gya (“billion years ago (short scale): 10⁹ years ago”).
Abbreviation of billion years ago (A symbol for a unit of measure.) billion years ago (long scale):10¹² years ago: a trillion years ago (short scale).
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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.