Nonce word
A nonce word (also called an occasionalism) is a lexeme created for a single occasion to solve an immediate problem of communication. The term is used because such a word is created "for the nonce". All nonce words are also neologisms. Some nonce words have a meaning and may become an established part of the language, while others are essentially meaningless and disposable and are useful for exactly that reason, for instance in child language testing. The term nonce word was apparently the creation of James Murray, the influential editor of the Oxford English Dictionary.