n.[U]

1. 被遗忘，湮没
   Many ancient cities have long since passed into oblivion.

   许多古代的城市早已湮没。

2. 遗忘，失去感觉
   I sank back into oblivion.

   我又什么都感觉不到了。

3. 【律】大赦，赦免

n.

1. the state of being unaware of what is happening around one.
2. the state of being forgotten.
3. destruction or extinction.
4. Law,  historical amnesty or pardon.