zettasecond

/Z EH1 T AH0 S EH0 K AH0 N D/

noun

1
(metrology) 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)

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