Definition of "selfish"

selfish

/ˈsɛlf.ɪʃ/

adjective
comparative more selfish or (proscribed) selfisher, superlative most selfish or (proscribed) selfishest
1. (clarification of this definition is needed)(The addition of quotations indicative of this usage is being sought:) Holding one's own self-interest as the standard for decision making.
  Quotations
  “We all have both a selfish separate self, and an Inner Being that is One with the Universal Spirit. In this sense, every human has a sort of ‘split personality’. We are all kind of what you call ‘schitzy’ with these two sides, these two people living within us. And they are in total opposition. The free will dictates which of these two sides will have its way in our life, at every given moment.”
  1997, John Peniel, chapter 10, in The Children Of The Law Of One & The Lost Teachings Of Atlantis, page 127
2. Having regard for oneself above others’ well-being.
  Quotations
  Take warning by my fate, and shun that flowery and bewitching path; for in its labyrinths the good, the gentle, the kind-hearted, and the benevolent, are too often lost; while the sordid and the selfish scarcely so much as run a hazard.
  1823, James Hogg, “Peril First. Love. Circle Third.”, in The Three Perils of Woman; or, Love, Leasing, and Jealousy. […], volume I, London: Longman, Hurst, Rees, Orme, Brown, and Green, […], page 277
  The most rapid and most seductive transition in all human nature is that which attends the palliation of a ravenous appetite. […] Can those harmless but refined fellow-diners be the selfish cads whose gluttony and personal appearance so raised your contemptuous wrath on your arrival?
  1922, Ben Travers, A Cuckoo in the Nest‎, Garden City, N.Y.: Doubleday, Page & Company, published 1925
3. (video games) Of video game characters: relying on their own actions and capabilities to be effective in the game, rather than on other characters.
  Quotations
  With that said, there is a perk to Xiao being a selfish DPS. He plays like Razor where he needs to be out in the field more than 90 percent of the time. Compared to Diluc, Xiao is more independent when it comes to dealing damage.
  2021, Sid Natividad, Thegamer‎