"After He had removed him, He raised up David to be their king, concerning whom He also testified and said, 'I HAVE FOUND DAVID the son of Jesse, A MAN AFTER MY HEART, who will do all My will.'
Probably from the base of oros; right (as rising), i.e. (perpendicularly) erect (figuratively, honest), or (horizontally) level or direct -- straight, upright.