autology

noun3

1. •
   The property of a word or phrase which describes itself.

   • The words multisyllabic and sesquipedalian display autology: multisyllabic is a multisyllabic word, and sesquipedalian is a sesquipedalian word.
2. •
   The ability of a concept to apply to itself.
3. •
   (literary) The study of oneself.

   • According to Huxley, the illustration of the doctrine of the self belongs to “autology rather than psychology". — 2014