Definition of neologism
1 : a new word, usage, or expression
technological neologisms
2 psychology : a new word that is coined especially by a person affected with schizophrenia and is meaningless except to the coiner, and is typically a combination of two existing words or a shortening or distortion of an existing word
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Time Traveler for neologism
The first known use of neologism was in 1772
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