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trillion
1680s, from French trillion, from Italian trilione; see tri- + million. In the U.S., the fourth power of a thousand (one thousand billion, 1 followed by 12 zeroes); in Great Britain, the third power of a million (one million billion, 1 followed by 18 zeroes), which is the original sense. Compare billion.
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Definitions of trillion from WordNet
Dictionary entries near trillion
trilateral
trilby
trilemma
trilingual
trill
trillion
trillionth
trillium
trilobite
trilogy
trim