quadrillion
pron, det, n(pl unchanged or ~s 復數或不變或作 quadrillions) (after a or one, a number, or an indication of quantity 用於a或one之後或用於數目或表示數量的詞語之後)
1 (Brit) number shown by 1 followed by 24 zeros; one million to the power of 4 *1後有24個0的數; 一百萬的4次冪.
2 (US) number shown by 1 followed by 15 zeros; one thousand to the power of 5 *1後有15個0的數; 一千的5次冪.