n.
- The cardinal number equal to 1012.
- Chiefly British. The cardinal number equal to 1018.
[French : tri-, third power (from Latin tri-, tri-) + (m)illion, million (from Old French milion; see million).]
trillion tril'lion adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.