"Rear seatbacks" refers to the backs of the seats in the back of a vehicle. It's the part of the seat that you lean against when sitting in the back. Full definition
Features on the 2013 LR4 include eight - way power front Captain's Chair leather front seats with power lumbar support for the driver, a split folding rear seatback with reclining rear seats, power steering, mirrors, windows and door locks and a tilt / telescoping steering wheel with audio and cruise controls on the wheel. (fourwheeler.com)
Available Remote Seatback Release For loading larger items, the split rear seatback folds flat at the push of two cargo area - mounted buttons. (kbb.com)
With one or both sections of the split - folding rear seatbacks down, together with the available flat load floor and the generous height provided by the roofline, the MINI Clubman offers more flexibility and practical value for all kinds of transportation requirements. (topspeed.com)