Definition of "nonillion" in English

numeral

1. (US, modern British & Australian, short scale) 10³⁰.

   • Do ya not be knowin' that there are 10 nonillion atoms within the likes of us?
   • Making certain bold assumptions, my assistant Una determined that chilling the sun’s core to below 10 million degrees would require an ice cube 562,000 miles on a side. If you were planning on using standard-sized cubes from your kitchen freezer, you’d need about 45 nonillion of them.

2. (dated, British & Australian, long scale) 10⁵⁴.

noun

1. (hyperbolic) An unspecified very large number.

   • ‘I then looked into the zatetic forest behind it / And saw a nonillion, no, a novemdecillion of them!’.