Definition of nonillion in English:

nonillion

noun

  • Originally (especially in Britain): the cardinal number equal to the ninth power of a million (1054). Now (originally US): the cardinal number equal to the tenth power of a thousand (1030).

adjective

  • Numbering a nonillion; (hyperbolically) a very great many, countless.

Origin

Late 17th century; earliest use found in John Locke (1632–1704), philosopher. From French nonillion the cardinal number equal to the ninth power of a million from classical Latin nōnus ninth + French -illion (in million).

Pronunciation

nonillion

/nɒˈnɪljən/