neologism

noun
🔊/niˈɒlədʒɪzəm/
🔊/niˈɑːlədʒɪzəm/
(formal)
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  1. a new word or expression or a new meaning of a word新词;新语汇;新义Topics Languagec2
    Word Originearly 19th cent.: from French néologisme.