rectitude (n.)youdaoicibaDictYouDict[rectitude 词源字典]
early 15c., "quality of being straight," from Middle French rectitude (14c.), from Late Latin rectitudinem (nominative rectitudo) "straightness, uprightness," from Latin rectus "straight" (see right (adj.1)). Sense of "upright in conduct or character" is from 1530s.[rectitude etymology, rectitude origin, 英语词源]