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Entry 3 senses Webster, 1913

Extinction

/ĭk-stĭng'-kshən/ · Ex·tinc·tion · IPA /ɪkˈstɪŋkʃən/
01 n. The act of extinguishing or making extinct; a putting an end to; the act of putting out or destroying light, fire, life, activity, influenc…
  1. 1.
    The act of extinguishing or making extinct; a putting an end to; the act of putting out or destroying light, fire, life, activity, influence, etc.
  2. 2.
    State of being extinguished or of ceasing to be; destruction; suppression; as, the extinction of life, of a family, of a quarrel, of claim.
  3. 3.
    The ceasing to exist of a species of living organism, such as a plant or animal, whose numbers declined to the point where the last member of the species died and therefore no new members of the species could ever again be born.