De verborum significatione libri XX ('Twenty Books on the Meaning of Words'), also known as the Lexicon of Festus, is an epitome compiled, edited, and annotated by Sextus Pompeius Festus from the encyclopedic works of Verrius Flaccus. Festus' epitome is typically dated to the 2nd century, but the work only survives in an incomplete 11th-century manuscript and copies of its own separate epitome.