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WordReference Random House Learner's Dictionary of American English © 2024tril•lion /ˈtrɪlyən/USA pronunciation n., pl. -lions, (as after a numeral) -lion, adj. n. [countable] - a number written in the U.S. by 1 followed by 12 zeros, and in Great Britain by 1 followed by 18 zeros:a trillion; several trillions.
- Often, trillions. [plural] a very great number or amount:trillions of little ants on the beach.
adj. [after a number and before a noun] - amounting to one trillion in number:one trillion dollars.
tril•lionth, n. [countable], adj. See the usage note under hundred. WordReference Random House Unabridged Dictionary of American English © 2024tril•lion (tril′yən),USA pronunciation n., pl. -lions, (as after a numeral) -lion, adj. n. - a cardinal number represented in the U.S. by 1 followed by 12 zeros, and in Great Britain by 1 followed by 18 zeros.
adj. - amounting to one trillion in number.
- French, equivalent. to tr(i)- tri- + (m)illion million
- 1680–90
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