Flotation

Part of speech: noun (n.)

1. The act, process, or state of floating.

2. The science of floating bodies. Center of flotation. (Shipbuilding) (a) The center of any given plane of flotation. (b) More commonly, the middle of the length of the load water line. Rankine. -- Plane, or Line, of flotation, the plane or line in which the horizontal surface of a fluid cuts a body floating in it. See Bearing, n., 9 (c). -- Surface of flotation (Shipbuilding), the imaginary surface which all the planes of flotation touch when a vessel rolls or pitches; the envelope of all such planes.