Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • prefix In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 1021. Symbol: Z

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἑπτά (hepta), for the seventh order of 103. The consonants pt are reduced to tt as in Italian, by analogy with peta-; the letter z was added, as a start to running through the alphabet backwards.

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