- noun the process of a species dying out
- noun the effect by which a beam of light is reduced in intensity as it passes through a solution
- In biology, the annihilation of an entire species. In astronomy, the dimming and reddening of starlight by interstellar dust, which in free space in our part of the galaxy seems to happen at a rate of about one magnitude per 1000 parsecs, away from major dust clouds. The dimming of starlight by the Earth’s atmosphere before it reaches ground-based telescopes is also termed extinction.
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