Merriam-Webster Online Dictionary

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2 entries found for extinction.
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Main Entry: ex·tinc·tion
Pronunciation: ik-'sti[ng](k)-sh&n
Function: noun
Date: 15th century
1 : the act of making extinct or causing to be extinguished
2 : the condition or fact of being extinct or extinguished; also : the process of becoming extinct <extinction of a species>
3 : the process of eliminating or reducing a conditioned response by not reinforcing it