n.[U]

1. 滅絕；消滅
   Apes are in danger of extinction

   猿類正處於絕種的危險之中。

2. 熄滅；撲滅；破滅
   the extinction of one's hopes

   希望的破滅

   the extinction of a fire

   一場火的撲滅

n.

1. the state or process of being or becoming extinct.
2. Physics  reduction to zero of the intensity of light or other radiation passing through a medium, due to absorption, reflection, or scattering.