WordNet sense 1 (a very large indefinite number (usually hyperbole)):

jillion, million, trillion, zillion

WordNet sense 2 (the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen):

one million million

WordNet sense 3 (the number that is represented as a one followed by 9 zeros):

one thousand million

WordNet sense 4 (being or denoting a numerical quantity but not order):

cardinal