Zettasecond

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An SI unit of time equal to 10²¹ seconds. Symbol: Zs. (= trillions of years, a hypothetical time span that is meaningless except in speculative contexts such as theoretical physics, philosophy, religion, and humorous hyperbole)

    "Holonyms: yottasecond < ronnasecond < quettasecond"

Example

More examples

"Holonyms: yottasecond < ronnasecond < quettasecond"

Etymology

From zetta- + second.

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