rectitude (n.)

early 15c., "straightness, quality of being straight or erect," from Old French rectitude (14c.) and directly from Late Latin rectitudinem (nominative rectitudo) "straightness, uprightness," from Latin rectus "straight" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line"). Sense of "uprightness in conduct or character, rightness of principle or practice" is from 1530s.