cardinal number
(pl. trillions or (with numeral or quantifying word) same)
- a million million (1,000,000,000,000 or 1012).
▸Brit. dated a million million million (1,000,000,000,000,000,000 or 1018).
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(trillions)
informal a very large number or amount.
Derivative
- trillionth ordinal number.
Etymology
C17: from Fr., from million, by substitution of the prefix tri- ‘three’ for the initial letters.
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