cash flow: the excess of cash revenues over cash outlays in a give period of time (not including non-cash expenses)
income: the financial gain (earned or unearned) accruing over a given period of time
metacenter: (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship