Extinction

n.	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.	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.	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.

Noun	1.	extinction - no longer in existence; "the extinction of a species" Synonyms: defunctness
	2.	extinction - no longer active; extinguished; "the extinction of the volcano"
	3.	extinction - the reduction of the intensity of radiation as a consequence of absorption and radiation
	4.	extinction - complete annihilation; "they think a meteor cause the extinction of the dinosaurs" Synonyms: extermination
	5.	extinction - a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus Synonyms: experimental extinction
	6.	extinction - the act of extinguishing; causing to stop burning; "the extinction of the lights" Synonyms: extinguishing, quenching

abolishment, abolition, abscission, amputation, annulment, bane, biological death, blackout, blocking, burning out, burnout, cessation of life, choking, choking off, clinical death, controlling, crossing the bar, curtains, damping, death, death knell, debt of nature, decease, dematerialization, demise, departure, deracination, destruction, disappearance, disappearing, dispersion, dissipation, dissolution, dissolving, doom, dousing, dying, ebb of life, elimination, end, end of life, ending, eradication, erasure, eternal rest, evanescence, evaporation, excision, exclusion, exit, expiration, extermination, extinguishment, extirpation, fadeaway, fadeout, fading, final summons, finger of death, fire fighting, flame-out, going, going off, going out, grave, hand of death, jaws of death, knell, last debt, last muster, last rest, last roundup, last sleep, leaving life, liquidation, loss of life, making an end, melting, mutilation, negation, nullification, occultation, parting, passing, passing away, passing over, perishing, purge, putting out, quenching, quietus, release, rescission, rest, reward, rooting out, sentence of death, shades of death, shadow of death, silencing, sleep, smotheration, smothering, snuffing, snuffing out, somatic death, stifling, strangulation, suffocation, summons of death, suppression, uprooting, vanishing, vanishing point, voiding, wipe