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Use "postdating" in a sentence
"A postdating is a word that is later than the latest example we have; if we are looking for one, it is probably because we believe that a word is still current but we don't have an example in any recent decade."
"Secretary of State Rebecca Vigil-Giron fabricated a letter -- postdating it Aug"
"Some googling turn'd up a paper arguing for aspirate devoicing postdating Grassman's law, on the basis of roots where G.L. doesn't produce alternation and which do not devoice in Greek."