Greek ἐπιμαρτύρησις (epimarturēsis); also antimarturēsis, "contradiction"
1. Key Texts
Quote from Diogenes Laertius 10.34Opinion they also call 'supposition', and they say that it is true and false. If it is attested or uncontested, it is true; if it is unattested or contested, it comes out false. Hence their introduction of that which awaited - for example, waiting and getting near the tower and learning how it appears from near by. (tr. Long & Sedley)