neologism

Short definition from Wiktionary

Noun

1. 1
   A word or phrase which has recently been coined; a new word or phrase.
2. 2
   An existing word or phrase which has gained a new meaning.
3. 3
   The act or instance of coining, or uttering a new word.
4. 4
   The newly coined, meaningless words or phrases of someone with a psychosis, usually schizophrenia.
5. 5
   Synonym of neology.