Giga-annum

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 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)."

Synonyms

All synonyms
gigayear

Example

More examples

"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)."

Etymology

From giga- + annum.

More for "giga-annum"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.