1670s, from Latin quintus "the fifth" (see quinque-) + ending from million. Compare billion. In Great Britain, the fifth power of a million (1 followed by 30 zeroes); in U.S. the sixth power of a thousand (1 followed by 18 zeroes).
实用例句
1. Quintillion did it for Roman education , selecting, as he said, both ancient and modern classics.
