Meaning of “oblivion” - Learner’s Dictionary

oblivion

noun [ U ] uk us /əˈblɪviən/
NOT REMEMBERED

a situation in which someone or something is not remembered:

to disappear into oblivion
NOT AWARE

a situation in which you are not aware of what is happening around you:

He drank himself into oblivion.

(Definition of “oblivion” from the Cambridge Learner’s Dictionary © Cambridge University Press)