giga-annum

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giga-annum

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From giga- + annum.

noun giga-annums

Synonym of gigayear: a billion years. 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).
Similar: gigayear

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MLA

"giga-annum." Wiktionary, via Micwyn, micwyn.com/word/giga-annum. Accessed 6 Nov. 2026.

APA

giga-annum. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/giga-annum

Chicago

"giga-annum." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/giga-annum.

BibTeX

@misc{giga_annum_2026,
  title = {giga-annum},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/giga-annum},
  urldate = {2026-11-06}
}