FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

diabebaioomai διαβεβαιόομαι — dee-ab-eb-ahee-o'-om-ahee — middle voice of a compound of 1223 and 950; to confirm thoroughly (by words), i.e. asseverate:--affirm constantly.

see GREEK for 1223

see GREEK for 950