quadrillion

num

1. (Australian, British, US, modern)A thousand trillion (logic: 1,000 × 1,000⁴): 1 followed by fifteen zeros, 10¹⁵.

   ““I’m not sure I understand why we have to send a quadrillion-credit mission to another galaxy.” He looked fleetingly amused. “Quintillion... and we don’t have a choice, Harper. Any of us, really, but humanity especially.””

   “Integrating data from all continents and major biomes, we conservatively estimate 20 × 10¹⁵ (20 quadrillion) ants on Earth, with a total biomass of 12 megatons of dry carbon.”

2. (Australia, UK, dated)A million trillion (logic: 1,000,000⁴): 1 followed by twenty-four zeros, 10²⁴.

noun

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

   “They'd never understand — not in a quadrillion years.”

   “Me, I never refuse a meal, and believe me I seen some heavy weather. I musta flown a quadrillion miles and I never did have a problem.”

   “The sky is so absolutely clear with a quadrillion stars.”

   “She's named after this famous singer from a quadrillion years ago.”