In Canto Two of his poem John Shade (the poet in VN's novel Pale Fire, 1962) tells about his dead daughter. Asking her mother what this or that word means, Hazel Shade mentions the word sempiternal:
She was my darling - difficult, morose -
But still my darling. You remember those
Almost unruffled evenings when we played
Mah-jongg, or she tried on your furs, which made
Her almost fetching; and the mirrors smiled,
The lights were merciful, the shadows mild,