Definition of "quintillion" in English

numeral

1. Either of two very large amounts:

2. (colloquial, hyperbolic) An unspecified very large number.

   • Near-synonyms: gazillion; see also Thesaurus:zillion
   • He had like a quintillion excuses for why he couldn't meet his obligation to me.

noun

1. (figuratively, slang, hyperbolic) Any very large number, exceeding normal description.