trillion

• POS: Adjective, Definite Article, Noun
• HYPHEN: tril=lion

CIDE DICTIONARY

trillion, 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.  [1913 Webster]

OXFORD DICTIONARY

trillion, n. (pl. same or (in sense 3) trillions)
1 a million million (1,000,000,000,000 or 10(12)).
2 (formerly, esp. Brit.) a million million million (1,000,000,000,000,000,000 or 10(18)).
3 (in pl.) colloq. a very large number (trillions of times).

Usage

Senses 1-2 correspond to the change in sense of billion.

Derivative

trillionth adj. & n.

Etymology

F trillion or It. trilione (as TRI-, MILLION), after billion

ROGET THESAURUS

trillion

Five

N five, five, cinque, quint, quincux, six, half-a- dozen, half dozen, seven, eight, nine, three times three, dicker, ten, decade, eleven, twelve, dozen, thirteen, long dozen, baker's dozen, quintuplet, twenty, score, twenty-four, four and twenty, two dozen, twenty-five, five and twenty, quarter of a hundred, forty, two score, fifty, half a hundred, sixty, three score, seventy, three score and ten, eighty, four score, ninety, fourscore and ten, sestiad, hundred, centenary, hecatomb, century, hundredweight, cwt, one hundred and forty-four, gross, thousand, chiliad, millennium, thousand years, grand, myriad, ten thousand, ban, man, ten thousand years, banzai, lac, one hundred thousand, plum, million, thousand million, milliard, billion, trillion, five, quinary, quintuple, fifth, senary, sextuple, sixth, seventh, septuple, octuple, eighth, ninefold, ninth, tenfold, decimal, denary, decuple, tenth, eleventh, duodenary, duodenal, twelfth, in one's 'teens, thirteenth, vicesimal, vigesimal, twentieth, twenty-fourth, vicenary, vicennial, centuple, centuplicate, centennial, centenary, centurial, secular, hundredth, thousandth.