Tilt and turn window for a building comprising: - at least one opening panel, - a fixed frame, - a fitting system provided between the fixed frame and the opening panel, the fitting system comprising locking elements in order to maintain the opening panel, relative to the fixed frame, in a locked closed position, - a motorised actuation device for displacing, by tilting, the opening panel relative to the fixed frame, ° the motorised actuation device comprising: ▪ an electromechanical actuator, the electromechanical actuator comprising an electric motor and an output shaft, the electromechanical actuator being disposed on a part fixed relative to the window, ▪ a flexible element, the flexible element being connected, on the one hand, to the opening panel and, on the other hand, to the electromechanical actuator, during closing of the opening panel relative to the fixed frame by means of the motorised actuation device, from an opened position by tilting the opening panel relative to the fixed frame, the flexible element is actuated by the electromechanical actuator, the fitting system being of the turning-tilting type, so as to be able to pivot the opening panel, relative to the fixed frame, about a first axis of rotation and to be able to tilt the opening panel, relative to the fixed frame, about a second axis of rotation, the flexible element extending between the opening panel and the fixed frame from the side of the window comprising hinge elements (17a, 17b) for displacing the opening panel relative to the fixed frame, the hinge elements (17a, 17b) being aligned according to the first axis of rotation of the opening panel relative to the fixed frame, the locking elements of the fitting system being configured to be placed manually into an unlocked state prior to opening, by pivoting or by tilting the opening panel relative to the fixed frame, characterised in that the flexible element comprises at least one elastic part, and in that a tilting movement of the opening panel, relative to the fixed frame, about the second axis of rotation towards an opened position by tilting, is implemented by exerting a force on the flexible element so as to elongate elastically said at least one elastic part of the flexible element. - at least one opening panel, - a fixed frame, - a fitting system provided between the fixed frame and the opening panel, the fitting system comprising locking elements in order to maintain the opening panel, relative to the fixed frame, in a locked closed position, - a motorised actuation device for displacing, by tilting, the opening panel relative to the fixed frame, ° the motorised actuation device comprising: ▪ an electromechanical actuator, the electromechanical actuator comprising an electric motor and an output shaft, the electromechanical actuator being disposed on a part fixed relative to the window, ▪ a flexible element, the flexible element being connected, on the one hand, to the opening panel and, on the other hand, to the electromechanical actuator, ▪ an electromechanical actuator, the electromechanical actuator comprising an electric motor and an output shaft, the electromechanical actuator being disposed on a part fixed relative to the window, ▪ a flexible element, the flexible element being connected, on the one hand, to the opening panel and, on the other hand, to the electromechanical actuator,