Word.ws English Dictionary

gigannum

gigannum is the rare form of giga-annum.

Meaning of giga-annum

Noun

giga-annum (plural giga-annums)

  1. 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).2000, A. S. Weber, Nineteenth-Century Science: An Anthology, →ISBN, page 387
    Synonyms:
    gigayear

Forms of gigannum

pluralgigannums

Questions about gigannum

What is gigannum the rare form of?
Gigannum is the rare form of giga-annum.

Words near gigannum in the dictionary

  1. Gigaminxes
  2. gigamp
  3. gigamps
  4. giganewton
  5. giganewtons
  6. gigannum
  7. gigannums
  8. giganotosaurus
  9. giganotosauruses
  10. gigantactinid
  11. gigantactinids

Source and license

Adapted from Wiktionary: gigannum (page history and authors); giga-annum (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “gigannum.” Word.ws, https://word.ws/gigannum. Based on Wiktionary, CC BY-SA 4.0.