Preoccupation with oneself to the exclusion of everything else.

Satisfied with oneself, especially over-satisfied; smug; slightly arrogant.

(linear algebra) Of a vector space, isomorphic to its dual space. / (mathematics, in projective geometry) Of a proposition that is equivalent to its dual.

Having, or behaving as if having, too high of an opinion of one's own importance.

That refers to itself or oneself. / (specifically) In a literary work: referring to the author or the author's other works.

(dated) Alternative spelling of oneself

Reliant upon oneself; trusting to one's own powers or judgment.

The practice of bettering oneself without relying on the assistance of others. / (law) An act of redressing or preventing a wrong by one's own actions rather than through legal proceedings.

Able to generate a copy of itself.

Exhibiting tendencies of self-indulgence.