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From The Collaborative International Dictionary of English v.0.48:
Neologism \Ne*ol"o*gism\, n. [Cf. F. n['e]ologisme.] 1. The introduction of new words, or the use of old words in a new sense. --Mrs. Browning. [1913 Webster] 2. A new word, phrase, or expression. [1913 Webster] 3. A new doctrine; specifically, rationalism. [1913 Webster]