neologismPronunciation: /nɪˈɒlədʒɪz(ə)m/Translate neologism | into Italian Definition of neologism noun a newly coined word or expression. [mass noun] the coining or use of new words. Derivatives neologist noun neologizePronunciation: /-dʒʌɪz/ (also neologise) verb Origin: early 19th century: from French néologismeneologism in other Oxford dictionaries Definition of neologism in the US English dictionary