"Boundary/limit before which"; standard Latin phrase used in archaeology, palaeography, epigraphy, and textual dating to denote the latest possible date of an object or text's creation. Thus, the Gallus papyri found at Qasr Ibrim have a terminus ante quem of about 60 A.D., based on the latest known date of the fort's Roman occupation, and a terminus post quem of 23 B.C.

Generally used whenever a date cannot be set within a reasonably specific time-frame.