Definition of "neologism"

(linguistics, lexicography, countable) A word or phrase which has recently been coined; a new word or phrase, or an existing one which has gained a new meaning.  examples

(linguistics, uncountable) The act or instance of coining, or uttering a new word.  examples

(psychiatry) The newly coined, meaningless words or phrases of someone with a psychosis, usually schizophrenia.  examples

(theology, historical) Synonym of neology.