(evolutionary theory) A process by which heritable traits conferring survival and reproductive advantage to individuals, or related individuals, tend to be passed on to succeeding generations and become more frequent in a population, whereas other less favourable traits tend to become eliminated; the differential survival and reproduction of phenotypes.

The process or act of selecting. / Something selected. / A variety of items taken from a larger collection. / A musical piece. / (databases) A set of data obtained from a database using a query.

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.

(evolutionary theory) The gene regarded as the primary driver and beneficiary of the evolutionary process.

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

Act or process of referring to itself or oneself.

A prediction that, by being voiced, causes itself to come true.

Preoccupation with oneself to the exclusion of everything else.

Having, exhibiting or motivated by no concern for oneself but for others; unselfish.