from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The extinction of a large number of species within a relatively short period of time, as between the Cretaceous and Tertiary Periods when three-quarters of all species on earth, including most dinosaurs, became extinct.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology A sharp decrease in the total number of
speciesin a relatively short period of time.
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