Mon·si·gnor also
mon·si·gnor 
(m
ŏn-s
ēn
y
ər)
n. Roman Catholic Church 1. A title conferred by the pope on a high-ranking male cleric, such as a protonotary apostolic.
2. A cleric holding such a title.
3. Abbr. Msgr. or Mgr. Used as a form of address prefixed to the name of such a cleric.
[Italian, from French Monseigneur; see MONSEIGNEUR.]
Mon′si·gnori·al (mŏn′sēn-yôrē-əl) adj.