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| ex·tinc·tion [ ik stíngksh'n ] (plural ex·tinc·tions) |
noun |
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| Definition: |
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1. fact of becoming extinct: the gradual process by which a group of related organisms dies out
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2. obsolescence: the process or fact of disappearing completely from use
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3. geology process of becoming inactive: the permanent ceasing of eruptions in a volcano
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4. social sciences law state of being no longer valid: the state of no longer being valid or practiced, or the process of ceasing to be valid or practiced
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5. destruction of somebody or something: the destruction or killing off of somebody or something
  the extinction of self and ego through meditation
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6. physics astronomy lowering of radiation intensity: the reduction of radiation intensity because of absorption or scattering as it passes through matter. This effect is observed in the reduction in the intensity of electromagnetic radiation reaching Earth from astronomical objects because of the interference of interstellar gas and dust.
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7. psychology reduction in response: the decreasing or dying out of a behavioral response created by conditioning because of a lack of reinforcement
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| ex·tinc·tive adjective |
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