Reference meaning
exa-
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In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10¹⁸ (a short scale quintillion or long scale trillion); one million million million.
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This definition is reproduced from English Wiktionary, sense en-exa--en-prefix-en:Q152411, under the CC BY-SA 4.0. It has not yet received VocabularyBase editorial review. Read the source and license details.