All 3 Uses

oblivion
in
The Mill on the Floss
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Whenever his mind was wandering in the far past, he fell into this oblivion of their actual faces; they were not those of the lad and the little wench who belonged to that past.†
Chpt 3.8 *

oblivion = a state of being completely gone from memory, existence, or awareness
But these dead-tinted, hollow-eyed, angular skeletons of villages on the Rhone oppress me with the feeling that human life—very much of it—is a narrow, ugly, grovelling existence, which even calamity does not elevate, but rather tends to exhibit in all its bare vulgarity of conception; and I have a cruel conviction that the lives these ruins are the traces of were part of a gross sum of obscure vitality, that will be swept into the same oblivion with the generations of ants and beavers.†
Chpt 4.1
Behind all the delicious visions of these last hours, which had flowed over her like a soft stream, and made her entirely passive, there was the dim consciousness that the condition was a transient one, and that the morrow must bring back the old life of struggle; that there were thoughts which would presently avenge themselves for this oblivion.†
Chpt 6.13

Definitions:

(1) (oblivion)
state of complete loss—being totally forgotten, wiped out, or lost to awareness of what is going on
(2) (meaning too rare to warrant focus)