διαβεβαίωσις
From LSJ
Ἅγιος ὁ Θεός, Ἅγιος ἰσχυρός, Ἅγιος ἀθάνατος, ἐλέησον ἡμᾶς → holy God, holy Mighty, holy Immortal, have mercy on us
English (LSJ)
εως, ἡ, A assurance, δοῦναι, ἐργάζεσθαι, ib.24,35; asseveration, Hdn.Fig.p.96S.
Greek (Liddell-Scott)
διαβεβαίωσις: -εως, ἡ, ἰσχυρὰ βεβαίωσις, Γλωσσ.
Spanish (DGE)
-εως, ἡ
1 seguridad, confirmación ὁ τῶν φαινομένων λόγος [ἔδ] ωκε διαβεβ[αίωσι] ν Phld.Sign.24.36, cf. 35.35, Eus.M.22.901B, Basil.M.29.260C.
2 ret. afirmación resuelta, aseveración contundente Hdn.Fig.p.96.