Definitions from Wiktionary ( )

▸ adjective:  Holding one's own self-interest as the standard for decision making.
▸ adjective:  Having excessive or exclusive regard and concern for one's own well-being (ex. personal profit or pleasure) above that of others and take no consideration for others.
▸ adjective:  (video games) Of video game characters: relying on their own actions and capabilities to be effective in the game, rather than on other characters.
▸ adjective:  (biology) Related to or equivalent to a selfish gene; best understood as existing to preserve and replicate itself in competition with other entities at the same level of existence, rather than at the level of the individual or population containing it.

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