What does neologism mean?

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From our dictionary:

ne•ol•o•gism

Pronunciation: (nE-ol'u-jiz"um), [key]
n.
1. a new word, meaning, usage, or phrase.
2. the introduction or use of new words or new senses of existing words.
3. a new doctrine, esp. a new interpretation of sacred writings.
4. Psychiatry.a new word, often consisting of a combination of other words, that is understood only by the speaker: occurring most often in the speech of schizophrenics.