neologism (n.)youdaoicibaDictYouDict[neologism 词源字典]
"practice of innovation in language," 1772 (in a translation from French), from French néologisme, from neo- (see neo-) + Greek logos "word" (see lecture (n.)) + -ism. Meaning "new word or expression" is from 1803. Neological is attested from 1754.[neologism etymology, neologism origin, 英语词源]