The same word used to define itself
For example TLA is a three letter acronym; Antepreroxitone (words with the stress on the third from last sylable) is an antepreroxitone; Noun is a noun.
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
A word expressing a property which it also possesses itself is said to be autological.