mo ‧ dus op ‧ e ‧ ran ‧ di /ˌməʊdəs ˌɒpəˈrændi $ ˌmoʊdəs ˌɑːpə-/ BrE AmE noun [singular]
[ Date: 1600-1700 ; Language: Latin ; Origin: 'way of operating' ]
formal ( abbreviation M.O. ) a way of doing something that is typical of a particular person or group