noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An SI unit of time equal to 10¹⁸ seconds. Symbol: Es. (= 31 709 800 000 years, which is more time than has elapsed in the Universe, that is, since the Big Bang [about 13 800 000 000 years].)

   "Holonyms: zettasecond < yottasecond < ronnasecond < quettasecond"

Example

More examples

"Holonyms: zettasecond < yottasecond < ronnasecond < quettasecond"

Etymology

From exa- + second.

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