Answer:
A word or expression that is new or has a new use
Explanation:
The definition of neologism in the sentence include option C: "A word or expression that is new or has a new use".
Neologisms are newly created words, which are frequently spoken by children, but that when used by adults may indicate a mental disorder, since they do not make sense.
Neologisms remind us that language is not something set in stone, but an evolving body of work, subject to adjustment, deletions, additions, and change.
As new things are invented, as slang becomes acceptable, and as new technologies emerge, new words must fill in the gaps in language.
Therefore, correct option is C.
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