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.
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