| Billion (n.) According to the French and American method of numeration, a thousand millions, or 1,000,000,000; according to the English method, a million millions, or 1,000,000,000,000. See Numeration. Thesaurus Entries a billion, a crore, a lakh, a million, a myriad, a nonillion, a quadrillion, a thousand, a zillion, astronomical number, googol, googolplex, infinitude, infinity, jillion, large number, milliard, trillion, zillion |