Wall or ceiling panel and wall or ceiling assembly

A wall or ceiling panel, which, on one side edge of the panel, comprises a male coupling part and, on an opposite side edge of the panel, comprises a female coupling part;

• wherein the coupling parts are configured such that two of such panels, by means of the coupling parts, can be coupled to each other in a plane and thus a coupled condition can be realized between the panels;
• wherein the male coupling part comprises a tongue and the female coupling part comprises a groove, which tongue and groove, in the coupled condition, form a tongue and groove connection, which realizes a mechanical locking between the panels in the direction perpendicular to the plane of the panels;
• wherein the groove is bordered by a front lip and a rear lip;
• wherein the coupling parts each comprise a locking part, which locking parts, in the coupled condition, realize a mechanical locking between the panels in the direction in the plane of the panels and perpendicular to the side edges;
• wherein the panel forms a ceiling-high wall panel and/or has a length of at least 2400 mm;
• wherein the coupling parts are of the turning type;
• wherein the rear lip extends in distal direction beyond an open or free end of the front lip;
• and
• wherein the panel comprises a core of cement fiberboard or gypsum fiberboard.