postdating

noun

1. A later citation of a lexical item.

   “The new edition of the dictionary contains several postdatings.”

   “Indeed, for 10 of these terms, the latest known record was their inclusion in Hobson-Jobson, and without any published postdatings this may have suggested that those terms were obsolescent at the end of the nineteenth century.”

verb

1. (form-of, gerund, participle, present)present participle and gerund of postdate