Clearance
Clearance (klēr"ans) , noun
1.
The act of clearing; as, to make a thorough 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.
3.
Clear or net profit. — Trollope
4.
(Machinery) 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.
Collocations (1)
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.