Lewis Short
mansŭētūdo (noun F) : id.
* Tameness.
* Lit. (post-class.): elephanti,Just. 15, 4, 19.
* Trop.
* In gen., mildness, gentleness, clemency (class.): uti clementiā ac mansuetudine in aliquem,Caes. B. G. 2, 14: imperii,Cic. Verr. 2, 5, 44, § 114: morum,id. Off. 2, 9, 32: alterum genus orationis lenitatis et mansuetudinis,id. de Or. 2, 49, 200: animorum,id. Off. 2, 4, 15: hostes,Tac. A. 2, 72.
* In partic., in the times of the emperors, a complimentary title used in addressing them: mansuetudo tua, your clemency or your grace, Eutr. praef. ad Valent. Imp.
Charlton T. Lewis, Charles Short, A Latin Dictionary