English
ersatzer
From ersatz + -er.
Formed from ersatz + -er
Proto-Indo-European *sed- ‘to sit’
…
Old High German irsezzen
Middle High German ersetzen
German ersetzen ‘to replace, to substitute’
German Ersatz ‘replacement, substitute’
English ersatz
The story
Coined in 1986 by the philosopher David Kellogg Lewis.
Today it means
noun A proponent of ersatzism, the doctrine that possible worlds are merely abstract and do not have the same reality as the present world
Language periods are conventional ranges, not dates for this word.
Etymograph / ersatzer