/ əˈblɪviən; NAmE / noun [ U ]
1.
a state in which you are not aware of what is happening around you, usually because you are unconscious or asleep :
He often drinks himself into oblivion.
Sam longed for the oblivion of sleep.
2.
the state in which sb/sth has been forgotten and is no longer famous or important
SYN obscurity :
An unexpected victory saved him from political oblivion.
Most of his inventions have been consigned to oblivion.
3.
a state in which sth has been completely destroyed :
Hundreds of homes were bombed into oblivion during the first weeks of the war.
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WORD ORIGIN
late Middle English : via Old French from Latin oblivio(n-) , from oblivisci forget.