Bya
symbol
symbol ·Rare ·Advanced level
Definitions
Symbol
- 1 Abbreviation of billion years ago (A symbol for a unit of measure.); Synonym of Gya (“billion years ago (short scale): 10⁹ years ago”). usually
"The first (oldest) unit of time is the Precambrian Supereon, which covers much of Earth's history from its origins roughly 4.55 bya to 545 mya. Very primitive, one-celled life-forms arose as early as 4.0 bya and near the end of the era (570 mya) the oldest known fossils of multi-celled organisms appear."
- 2 Alternative spelling of bya (“billion years ago”).; Alternative spelling of bya (“billion years ago (short scale): 10⁹ years ago”). alt-of, alternative, usually
- 3 Alternative spelling of bya (“billion years ago”).; Alternative spelling of bya (“billion years ago (short scale): 10⁹ years ago”). alt-of, alternative, usually
- 4 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). dated, uncommon
- 5 Alternative spelling of bya (“billion years ago”).; Alternative spelling of bya (“billion years ago (long scale):10¹² years ago: a trillion years ago (short scale)”). alt-of, alternative, dated, uncommon
Show 1 more definition
- 6 Alternative spelling of bya (“billion years ago”).; Alternative spelling of bya (“billion years ago (long scale):10¹² years ago: a trillion years ago (short scale)”). alt-of, alternative, dated, uncommon
Synonyms
All synonymsExample
More examples"The first (oldest) unit of time is the Precambrian Supereon, which covers much of Earth's history from its origins roughly 4.55 bya to 545 mya. Very primitive, one-celled life-forms arose as early as 4.0 bya and near the end of the era (570 mya) the oldest known fossils of multi-celled organisms appear."
More for "bya"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.