tril'yun. [a word formed arbitrarily of three, or Gr. million.] The product of a million multiplied by a million, and that product multiplied by a million; or the product of the square of a million multiplied by a million. Thus 1, 000, 000 x 1, 000, 000=1, 000, 000, 000, 000, and this product multiplied by a million= 1, 000, 000, 000, 000, 000, 000.

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.