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βεβαι-όω, confirm, establish, make good, τοῖς δικασταῖς τὴν δόξαν Pl.Cri.53b; δωρεὰν Is.1.18; εἴτε δεξιὰς δοῖεν ἐβεβαίουν X.Cyr.8.8.2, etc.; ἔργῳ βεβαιούμενα, opp. ἀκοῇ λεγόμενα, Th.1.23; β. λόγον make good one's word, Lys.20.32; β. τὴν πρᾶξιν X.An.7.6.17; treat as valid, τὰς αὑτῶν αἰσθήσεις Metrod.1, cf. Epicur.Sent.24; β. τινί τι secure one the possession of a thing, οὐδ' ἡμῖν αὐτοῖς βεβαιοῦμεν [τὴν ἐλευθερίαν] Th.1.122; τοῖς θεοῖς βεβαιοῦντες τοὺς νόμους οὒς ἐψηφίσασθε Lys.6.29, cf. D.21.30; τὴν ἀρχήν τινι Plu.Sull.22; τὸν λόγον Ev.Marc.16.20:—
Med., establish for oneself, secure, σφᾶς αὐτούς Th. 1.33; τὴν ἀρχήν, τὴν φιλίαν τινός, Id.6.10,78; β. τινάς confirm them in one's interest, ib.34; βασιλείαν Paus.3.11.4; τὰ περὶ τῆς βοηθείας Plb.2.51.5.

2. Med., secure one's ground in argument, Pl.Tht. 169e; confirm oneself in an opinion, Id.Grg.489a, Prt.348d.

3. guarantee the validity of a purchase, warrant the purchaser's title, β. τινὶ τὸ βαλανεῖον Is.5.23, cf. Din.1.42, D.37.12, SIG46.4 (Halic., v B. C.); τὴν μίσθωσιν BGU1119.47 (i B. C.): generally, β. τοὺς κανόνας Arr.Epict.2.11.24.

II. intr., determine, show itself positively, τοῖσιν ἐνδοιαστῶς ἔχουσι ..ἐβεβαίωσε [ἡ νοῦσος] Hp.Epid.1.2.