Definitions

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

  • prefix nonstandard, rare In metric systems of units, multiplies the unit to which it is attached by 1027. Symbol: X

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἐννέα (ennea, "nine"), for the ninth order of 103, and the letter x, as the third term in a series running backwards through the alphabet. The final a indicates a positive power of ten.

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