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What does extinction mean?

Looking for the meaning or definition of the word extinction? Here's what it means.

Noun
  1. The action of making or becoming extinct; annihilation.
  2. (astronomy) The absorption or scattering of electromagnetic radiation emitted by astronomical objects by intervening dust and gas before it reaches the observer.
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Examples
They better understand the process of speciation, adaptation, and extinction.
As for biodiversity, the most important species threatened with extinction today is the human race.
The causes of its extinction remain unclear, but it is likely that rats, weasels, and cats played a role in its demise.
These whales have been hunted to near extinction, and only about 2,500 exist today.
Shown in cave paintings in France and Spain, these were a favourite quarry of Palaeolithic hunters, and were eventually hunted to extinction.
For too long we have regarded the extinction of Neanderthals as a chance historical accident.

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