Definition of centillion in US English:

centillion

noun

  • Originally: the cardinal number equal to the hundredth power of a million, represented by 1 followed by six hundred zeros (now chiefly British). Later also (originally US): the cardinal number equal to the hundred and first power of a thousand, represented by 1 followed by three hundred and three zeros. Also hyperbolically: a very large number or amount.

adjective

  • Numbering or amounting to a centillion.

Origin

Mid 18th century; earliest use found in The Scots Magazine. From classical Latin centum hundred + -illion.

Pronunciation

centillion

/sɛnˈtɪljən/