Trĭll'ion, n.

(trĭl'yun), n. [Fr. trillion, a word formed of Lat. tri, q. v., and L. Lat. millio, Fr. million, a million. Cf. BILLION, QUADRILLION, &c.] According to the English notation, the product of a million involved to the third power, or the number represented by a unit with eighteen ciphers annexed; according to the French notation, the number expressed by a unit with twelve ciphers annexed. See Note under NUMERATION.