A newly created word whose meaning is unknown to others (from Greek – neo = “new” + logos = “word”). The use of neologisms is common in children, but is considered indicative of brain damage or a thought disorder (like schizophrenia) when present in adults.
Example: “The only problem I have is my frustionating!”
Neologisms can exist outside of psychiatry and be seen in mainstream language, but only after they have been created and accepted by society (example; Stephen Colbert’s creation of the word ‘truthiness’ which has become an accepted word in society).
However, in a clinical setting, neologisms created by those with schizophrenia or other thought disorders are not frequently understood and bear a resemblance to “word salad” which is another aspect of schizophrenia (word salad is similar to ‘gibberish’, words in no discernible order that doesn’t make sense to anyone beyond the speaker).