sextillion

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/sɛksˈtɪljən/US:USA pronunciation: respellingUSA pronunciation: respelling(seks til′yən)


WordReference Random House Unabridged Dictionary of American English © 2026
sex•til•lion  (seks til′yən),USA pronunciation n., pl. -lions, (as after a numeral) -lion, adj. 
n. 
  1. a cardinal number represented in the U.S. by 1 followed by 21 zeros, and in Great Britain by 1 followed by 36 zeros.

adj. 
  1. amounting to one sextillion in number.
  • Latin sext(us) sixth + -illion, as in million
  • French
  • 1680–90
sex•til′lionth, adj., n. 

Collins Concise English Dictionary © HarperCollins Publishers::
sextillion /sɛksˈtɪljən/ n ( pl -lions, -lion)
  1. (in Britain, France, and Germany) the number represented as one followed by 36 zeros (1036)
  2. (in the US and Canada) the number represented as one followed by 21 zeros (1021)
Etymology: 17th Century: from French, from sex- + -illion, on the model of septillion

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