giga-annum

English

Alternative forms

gigaannum, (rare) gigannum, (abbreviation) Ga

Etymology

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).

Translations

10⁹ years — see gigayear

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