Lexical Definition

‎διαβεβαιόομαι‎ diabebaióomai (dee-ab-eb-ahee-o'-om-ahee) to insist G:V
middle voice of a compound of ‎διά‎ and ‎βεβαιόω‎

affirm constantly.

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
διαβεβαιοῦσθαι to affirm strongly Titus.3.8
διαβεβαιοῦνται they confidently assert 1Tim.1.7

Abbott-Smith

* δια-βεβαιόομαι, -οῦμαι
to affirm confidently: Tit 3:8; seq. περί, I Ti 1:7 (Cremer, 140).†

Abbott-Smith References

Book Refs
1 Timothy 1:7
Titus 3:8

Liddell-Scott-Jones

διαβεβαιόω-όω,

confirm, ὑπόληψιν [Refs 3rd c.AD+]:—usually middle διαβεβαιόω-όομαι, maintain strongly, affirm, confirm, [Refs 4th c.BC+]; to be positive, περί τινος [Refs 2nd c.BC+]:—passive, [Refs 1st c.BC+]