All 3 Uses

nostalgia
in
1984, by Orwell
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It was a wild, impossible notion, to be abandoned as soon as thought of; but the room had awakened in him a sort of nostalgia, a sort of ancestral memory.†
p. 96.9 *

nostalgia = longing for something past
The fragment of rhyme that Mr Charrington had taught him came back into his head, and he added half-nostalgically: "Oranges and lemons, say the bells of St Clement's!†
p. 146.3

nostalgically = with a longing for something past
He had a nostalgic vision of his corner table, with the newspaper and the chessboard and the ever-flowing gin.†
p. 293.2

Definitions:

(1) (nostalgia)
happiness that come with the memory of good times combined with a hint of sadness that those times are over
(2) (meaning too rare to warrant focus)