Word.ws English Dictionary

gigayear

gigayear noun: a billion years: a thousand million years, that is, a thousand thousand thousand years.

Noun

gigayear (plural gigayears)

  1. A billion years: a thousand million years, that is, a thousand thousand thousand years.
    • Holonyms: exasecond < zettasecond < yottasecond < ronnasecond < quettasecond
    • Meronyms: quectosecond < rontosecond < yoctosecond < zeptosecond < attosecond < femtosecond < picosecond < nanosecond < microsecond < millisecond < centisecond < decisecond < second < decasecond < minute < hectosecond < kilosecond < hour < day < week < megasecond < fortnight < month < year <...
    Synonyms:
    giga-annum, gigaannum, Ga

Examples of gigayear in a sentence

  • It's hard to tell the difference between a 5-gigayear, 8-gigayear, and 10-gigayear cluster for such a sparse object as this unless you've got very high-quality photometry.2002, William Harris of McMaster University in Hamilton, Canada. (quoted on Astronomy.com)
  • The fraction could be as high as 100% if the nuclear activity lasts much less than a gigayear.2007, Linda Siobhan Sparke; John S. Gallagher, III, Galaxies in the Universe, page 343:

Synonyms of gigayear

Forms of gigayear

pluralgigayears

Origin of gigayear

From giga- + year.

Questions about gigayear

What does gigayear mean?
Gigayear means a billion years: a thousand million years, that is, a thousand thousand thousand years.
How do you use gigayear in a sentence?
It's hard to tell the difference between a 5-gigayear, 8-gigayear, and 10-gigayear cluster for such a sparse object as this unless you've got very high-quality photometry.
What part of speech is gigayear?
Gigayear is a noun.
What is the plural of gigayear?
The plural of gigayear is gigayears.

Words near gigayear in the dictionary

  1. gigaword
  2. gigawords
  3. gigaxonin
  4. gigayacht
  5. gigayachts
  6. gigayear
  7. gigayears
  8. gigbag
  9. gigbags
  10. gigelira
  11. gigeliras

Source and license

Adapted from Wiktionary: gigayear (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.

Last updated:

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