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4.
verb: to make extinct.
The Chinese River Dolphin is extinct.
We extincted the Chinese River Dolphin.
We have completed the process of extincting the Chinese River Dolphin.
by yucatan April 16, 2008
 
1.
When a species(Dodo Bird) or entity(Rangers FC) ceases to exist, dies, is bereft of life, kicks the bucket, comes to an end.

An entity can become extinct due to an over-reliance on cheating to succeed and when that ability is taken away, it dies out, making the world a better place. Extinction is a natural and necessary occurrence that occurs to restore order and decency in the world.
Rangers FC became an extinct football club in 2012 due to an over reliance on cheating to succeed. Once the ability to cheat was taken away by HMRC the entity ceased to exist. A brand new club tried to take its place by cheating but it is expected to die fairly soon too.

The Dodo Bird is an extinct species.

Rangers FC and the Dodo bird are both extinct, have passed on, have ceased to exist, are bereft of life. The new club that is trying to take Rangers place has the same amount of trophies as the Dodo bird. The new club hope that someday they will be able to cheat their way to their first trophy and thus over take the Dodo bird in the honours list.
by HMRC June 15, 2012
 
2.
Adj. No longer existing or living.
The dodo is a species which is now extinct.
by Death to Trees January 07, 2004
 
3.
Gone. Wasted. Trashed. That feeling you get when you know you won't remember anything.
I'm going to be extinct after tonight and that's what I call a good night."
by TheStuffYouLearnInCollege April 17, 2011