1877, from German, literally “eternity.”
Examples from the Web for ewigkeit Historical Examples of ewigkeit
All we know is that they flew into the Ewigkeit and are “missing.”
Those found, he goes off with ponderous serenity into the ewigkeit.
Her determination of two hours ago had vanished into the Ewigkeit.
Ewigkeit was therefore originally time, and “for all time” came naturally to mean “for all eternity.”
F. Max Mller
When another week has rolled by and disappeared into the Ewigkeit, vary the menu.
Elizabeth Robins Pennell