zettasecond
noun
Meaning
- 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)
Etymology / origin
Etymology tree English zetta- English second English zettasecond From zetta- + second.
Sources
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