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Oblivion is the state of forgetting or being oblivious.
According to dictionary.reference.com, word origin:
My sentences using the word of the day:
^ She figured she must have been drugged. The bad man must have slipped a sedative into her drink hence the reason why she was in complete oblivion and unaware of her surroundings.
^ After his wife left him for a better life, Raj drank himself into oblivion for weeks on end.
^ The abandoned town was finally bulldozed into oblivion to make way for a strip mall.
Have fun using oblivion in your writing.