From pro and a derivative of aitia; to accuse already, i.e. Previously charge -- prove before.
see GREEK pro
see GREEK aitia
[αἴτιάομαι, : to accuse, bring a charge against; ἠτιασάμεθα is a various reading in Romans 3:9 for the προῃτιασάμεθα of the printed texts. (Proverbs 19:3; Sir. 29:5; frequent in secular writings) Synonym: see κατηγορέω.] STRONGS NT 4256: προαιτιάομαιπροαιτιάομαι, προαιτωμαι: 1 aorist 1 person plural προῃτιασάμεθα; to bring a charge against previously (i. e. in what has previously been said): τινα followed by an infinitive indicating the charge, Romans 3:9; where the prefix προ( makes reference to Romans 1:18-31; Romans 2:1-5, 17-29. Not found elsewhere.