Why was "tantrum" trending last week?
1620s, "act of selecting," from Latin selectionem (nominative selectio) "a choosing out, choice, selection," noun of action from past participle stem of seligere (see select (adj.)). Meaning "thing selected" is from 1805. Biological sense is from 1837; applied to actions of breeders (methodical selection), hence its use by Darwin (natural selection; 1857). French sélection is a 19c. borrowing from English.
selection se·lec·tion (sĭ-lěk'shən)
A natural or artificial process that favors or induces survival and perpetuation of one kind of organism over others that die or fail to produce offspring.