sedan /səˈdæn/ noun3 •(US, Australia) An automobile designed in a configuration with separate compartments for engine space, driver/passenger space, and luggage or (limited) cargo space.What we are observing in this sedan square-off is the cumulative effect of modern design technology on the family sedan. — 1986 •An enclosed windowed chair suitable for a single occupant, carried by at least two porters, in equal numbers in front and behind, using wooden rails that passed through metal brackets on the sides of the chair. •A handbarrow for transporting fish. formssedans