"extinction" in the noun sense
1. extinction
no longer active extinguished
"the extinction of the volcano"
2. extinction, defunctness
no longer in existence
"the extinction of a species"
3. extinction
the reduction of the intensity of radiation as a consequence of absorption and radiation
4. extinction, extermination
complete annihilation
"they think a meteor cause the extinction of the dinosaurs"
5. extinction, experimental extinction
a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
6. extinction, extinguishing, quenching
the act of extinguishing causing to stop burning
"the extinction of the lights"
Source: WordNet® (An amazing lexical database of English)
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