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\Tril"lion\, n. [F. trillion, formed from the pref. tri- in imitation of million a million. Cf. {Billion}.] According to the French notation, which is used upon the Continent generally and in the United States, the number expressed by a unit with twelve ciphers annexed; a million millions; according to the English notation, the number produced by involving a million to the third power, or the number represented by a unit with eighteen ciphers annexed. See the Note under {Numeration}.
In Britain, France, and Germany, 10^18 or a million cubed.
In the USA and Canada, 10^12.