No longer in existence; lost or especially having died out leaving no living representatives.
1
The thank you letter is really gone now, extinct among the under-65s.
2
Experts have warned that African elephants could become extinct within 10 years.
3
In some countries it is extinct, in the others it is rare.
4
Here was a race thought extinct for more than a thousand years.
5
Subsequently, DNA sequences have been published for a number of extinct species.