τεκμηριόω
From LSJ
ὡς μήτε τὰ γενόμενα ἐξ ἀνθρώπων τῷ χρόνῳ ἐξίτηλα γένηται → in order that so the memory of the past may not be blotted out from among men by time
English (LSJ)
A prove positively, Th.1.3, D.H.1.89, etc.; Ὅμηρος . . εἴ τῳ ἱκανὸς τεκμηριῶσαι if he seem a sufficient voucher, Th.1.9; τοσαῦτα ἐτεκμηρίωσεν ὅτι . .thus much evidence he gave to the fact that... Id.3.104; of symptoms, indicate, Orib.Syn. 9.43:—Pass., to be proved, τισι by facts, D.C.75.13. II later in Med., draw inferences, Phld.D.3.8, Ph.2.505, A.D.Pron.87.7; ἀπό τινων Phld.Sign.Fr.2.
German (Pape)
[Seite 1082] einen Beweis geben, beweisen, Thuc. 1, 9. 3, 104; u. med. aus Zeichen abnehmen, schließen, Sp., wie Philo.