- Official approval - Permission to proceed - The act of clearing; as, to make a thorough clearance. - A certificate that a ship or vessel has been cleared at
the customhouse; permission to sail. - Clear or net profit. - The distance by which one object clears another, as the
distance between the piston and cylinder head at the end of a stroke in
a steam engine, or the least distance between the point of a cogwheel
tooth and the bottom of a space between teeth of a wheel with which it
engages.