extinction

Short definition from Wiktionary

Noun

1. 1
   The action of making or becoming extinct; annihilation.
2. 2
   The absorption or scattering of electromagnetic radiation emitted by astronomical objects by intervening dust and gas before it reaches the observer.
3. 3
   The inability to perceive multiple stimuli simultaneously.
4. 4
   The fading of a conditioned response over time if it is not reinforced.