Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

trillion

play
noun tril·lion \ˈtri(l)-yən\

Simple Definition of trillion

  • : the number 1,000,000,000,000 : one thousand billion

  • : a very large amount or number

  • : the number 1,000,000,000,000,000,000 : one million million million

Full Definition of trillion

  1. 1 — see number table

  2. 2 :  an indeterminately large number <a trillion mosquitoes out tonight>

trillion adjective
tril·lionth play \-yən(t)th\ adjective or noun

Origin of trillion

French, from tri- + -illion (as in million)


First Known Use: 1690

Rhymes with trillion


TRILLION Defined for Kids

trillion

play
noun tril·lion \ˈtril-yən\

Definition of trillion

  1. :  a thousand billions





Seen and Heard

What made you want to look up trillion? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 6, 2016

an official order, decree, or edict

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez kittly-benders spindrift duvet
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ