ersatz (adj.) Look up ersatz at Dictionary.com
1875, from German Ersatz "units of the army reserve," literally "compensation, replacement, substitute," from ersetzen "to replace," from Old High German irsezzen, from ir-, unaccented variant of ur- (see ur-) + setzen "to set," from PIE root *sed- (1) "to sit." As a noun, from 1892.