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English
Etymology
From giga- + annum.
Noun
giga-annum (plural giga-annums)
- Gigayear, a billion years.
2000, A. S. Weber, Nineteenth-Century Science: An Anthology, →ISBN, page 387:Geophysicists today estimate the earth’s age to be 4.5–4.6 Ga (giga-annums = 1 x 109 years) based on data from lead isotopes (Dalrymple 403).
2014, Sophia Ahmed et al., “A Haploid System of Sex Determination in the Brown Alga Ectocarpus sp.”, in Current Biology, volume 24, number 17, →DOI:We report here the sequencing and genomic analysis of the SDR of Ectocarpus, a brown alga that has been evolving independently from plants, animals, and fungi for over one giga-annum.
2018, Ronald Martin, Earth’s Evolving Systems: The History of Planet Earth, 2nd edition, →ISBN, page 214:Possible cyanobacteria from the Apex charts of western Australia, which have been dated at ~3.5 (giga-annums, or billions of years).
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