rectitude (n.) Look up rectitude at Dictionary.com
early 15c., "quality of being straight," from Middle French rectitude (14c.), 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 "upright in conduct or character" is from 1530s.