/ ˈmʌfti; NAmE / noun
1.
[ C ] (also Mufti ) a Muslim who is an expert in legal matters connected with Islam
2.
[ U ] ( old-fashioned ) ordinary clothes worn by people such as soldiers who wear uniform in their job :
officers in mufti
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WORD ORIGIN
sense 1 late 16th cent.: from Arabic muftī , active participle of 'aftā decide a point of law.
sense 2 early 19th cent.: perhaps humorously from mufti (sense 1).