Definitions for exa-

This page provides all possible meanings and translations of the word exa-

Random House Webster's College Dictionary


  1. a combining form used in the names of units of measure equal to one quintillion of a given base unit:


Origin of exa-:

alter. of hexa-


  1. exa-(Prefix)

    In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10. Symbol: E

  2. Origin: From ἕξ, for the sixth order of 10.


  1. Exa-

    Exa is a unit prefix in the metric system denoting 1018 or 1000000000000000000. It was added to the International System of Units in 1975, and has the unit symbol E. Exa comes from the Greek ἕξ, used as a prefix ἑξά-, meaning six, because it is equal to 10006. Examples: ⁕Multiplying the 10240 megabytes of storage each Gmail user has with the estimated 260 million Gmail users, the total storage needed for Gmail is more than an exabyte. ⁕1 EeV = 1018 electronvolts = 0.1602 joule ⁕1 exasecond is approximately 32 billion years ⁕1 exametre is approximately 110 light years ⁕0.43 Es ≈ the approximate age of the Universe ⁕1.6 Em — 172 ± 12.5 light years — Diameter of Omega Centauri

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