antedating

verb

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

noun

1. The action of marking with an earlier date.
2. An earlier citation of a lexical item.

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

   “Had I access to large databases of scanned-in newspapers from the Philippines, or Africa, or India, etc., we would expect to see a good percentage of antedatings of the current earliest instances.”