NEOLOGISM [pronounced nee-ol-uh-jiz-uhm]
- a new word, usage, or expression
- a meaningless word coined by a psychotic
A "neologism" is a new word introduced into the language. I ran across this new word for the first time today. According to my research, it's first recorded usage was in 1803. It is not a neologism.
If only there were an adequate antonym...