[t_ɹ_ˈɪ_l_iə_n], [tɹˈɪli͡ən], [tɹˈɪliən]
Definitions of trillion

( in the United States and France) the number that is represented as a one followed by 12 zeros; " in England they call a trillion a billion"

the number that is represented as a one followed by 12 zeros; " in England they call a trillion a billion"

the number that is represented as a one followed by 18 zeros; " in England they call a quintillion a trillion"

one million million in the United States

one quintillion in Great Britain

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 the French system of numbering, followed in the United States, a unit followed by twelve ciphers: in the English system, a unit followed by eighteen ciphers.

Trillionth.

A million raised to the third power; a unit and eighteen ciphers.

A cardinal number; in the French ( also U. S.) system of numeration, a million millions; in the English system, the third power of a million.

The product of a million involved to the third power, and expressed by a unit with 18 ciphers annexed.

In the Eng. system of notation, a number represented by the third power of a million; the figure 1, followed by eighteen ciphers; in the F. and It. systems, the figure 1, followed by twelve ciphers.
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Usage examples for trillion

And so, my budget sets aside almost a trillion dollars over 10 years for additional needs. – Complete State of the Union Addresses from 1790 to the Present by Various

We traverse a few more trillion miles in our rapid course, and it shines out like a fine star of the first magnitude. – Astronomy for Amateurs by Camille Flammarion

Oh, I'd give a million dollars, a trillion dollars, she amended generously, to hear that roar. – Nan Sherwood on the Mexican Border by Annie Roe Carr

I've just counted up to three trillion two hundred and thirty seven billion, nine hundred and forty eight million, seven hundred and fifteen thousand, four hundred and and now you've gone and made me miss, and I'll have to count all over again. – Puss in Boots, Jr., and the Good Gray Horse by David Cory