Quad-ril'ion, n.

(kwod-ril'yun), n. [Fr. quadrillion, from Lat. quater, four times, and L. Lat. millio, Fr. million, a million. Cf. BILLION.] According to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed; according to the French notation, a unit with fifteen ciphers annexed. [See Note under NUMERATION.]