Latin word professus comes from Latin fateor (I acknowledge, own.. I confess, admit.. I show, indicate.)

Detailed word origin of professus

Dictionary entry	Language	Definition
fateor	Latin (lat)	I acknowledge, own.. I confess, admit.. I show, indicate.
profiteor	Latin (lat)	I declare publicly, own (up to) or confess openly, acknowledge, avow, profess.. I make a public statement or a return of.. I make a show of, show, display.. I offer freely, promise.. I profess, claim; I declare myself (as), practice (as).
professus	Latin (lat)