clearance is a Noun
[1] The act of clearing; as, to make a through clearance.
[2] A certificate that a ship or vessel has been cleared at the customhouse; permission to sail. Every ship was subject to seizure for want of stamped clearances. Durke
[3] Clear or net profit. Trollope.
[4] 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 cogwell tooth and the bottom of a space between teeth of a wheel with which it engages. Clearance space (Steam engine), the space inclosed in one end of the cylinder, between the valve or valves and the piston, at the beginning of a stroke; waste room. It includes the space caused by the piston`s clearance and the space in ports, passageways, etc. Its volume is often expressed as a certain proportion of the volume swept by the piston in a single stroke.
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