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In some senses, bya is marked as dated. Watch for register when choosing this word.
bya
symbol 6
Definitions
symbol
1
Abbreviation of billion years ago (A symbol for a unit of measure.)
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
Abbreviation of billion years ago (A symbol for a unit of measure.)
symbol
1
Alternative spelling of bya (“billion years ago”).
2
Alternative spelling of bya (“billion years ago”).
symbol
1
Alternative spelling of bya (“billion years ago”).
2
Alternative spelling of bya (“billion years ago”).
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