noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A billion years: a thousand million years, that is, a thousand thousand thousand years.

   "Holonyms: exasecond < zettasecond < yottasecond < ronnasecond < quettasecond"

Synonyms

All synonyms

gagiga-annumgigaannum

Example

More examples

"Holonyms: exasecond < zettasecond < yottasecond < ronnasecond < quettasecond"

Etymology

From giga- + year.

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