?ks?t??k??n n. 1 the act of making extinct; the state of being or process of becoming extinct. 2 the act of extinguishing; the state of being extinguished. 3 total destruction or annihilation. 4 the wiping out of a debt. 5 Physics a reduction in the intensity of radiation by absorption, scattering, etc. °°extinctive adj. [L extinctio (as EXTINCT)]
Last updated: 9/3/2011 12:48:30
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