proliferation (n.)youdaoicibaDictYouDict[proliferation 词源字典]
1859, "formation or development of cells," from French prolifération, from prolifère "producing offspring," from Latin proles "offspring" (see prolific) + ferre "to bear" (see infer). Meaning "enlargement, extension, increase" is from 1920; especially of nuclear weapons (1966).[proliferation etymology, proliferation origin, 英语词源]