A sedan /sɨˈdaen/ (Sɨˈdæn, American, Canadian, australian And New Zealand) english or (Saloon british And Irish) english is a passenger car in a-three box configuration With, A & B-c pillars and principal volumes articulated in separate compartments for, engine passenger and. cargon the U.S., the term sedan has been used to denote a car with fixed window frames, as opposed to the hardtop style without a B pillar and where the sash or window frame, if any, winds down with the glass.