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(metrology) 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].)
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.