a.

1. （火等）熄滅了的
   The volcano is extinct.

   這座火山是座死火山。

2. 消亡了的；破滅了的
   My hope of getting some employment was extinct.

   我要找到工作的希望落空了。

3. 絕種的，滅絕的
   The passenger pigeon is extinct.

   旅鴿已絕種。

4. （職位等）廢除了的；（貴族稱號等）無合法繼承人的
5. （法令，風俗等）過時的，失效的

adj.

1. (of a species or other large group) having no living members.
   ▸no longer in existence.
   ▸(of a volcano) not having erupted in recorded history.
2. (of a title of nobility) having no valid claimant.