How to pronounce plane:
Example: "The flight was delayed due to trouble with the airplane"
Example: "We will refer to the plane of the graph as the x-y plane"
Example: "He lived on a worldly plane"
Example: "The cabinetmaker used a plane for the finish work"
Example: "The machine shaved off fine layers from the piece of wood"
Example: "Plane the top of the door"
Of a surface: flat or level.