Pronunciation: (klēr'uns),[key] —n. 1. the act of clearing.
2. the distance between two objects; an amount of clear space: The bridge allowed a clearance of 37 feet at mean high water. 3. a formal authorization permitting access to classified information, documents, etc.
4. Also calledclear'ance sale". the disposal of merchandise at reduced prices to make room for new goods: He bought the coat for half price at a clearance. 5. a clear space; a clearing: The house stood in a clearance among the trees. 6. Banking.an exchange of checks and other commercial paper drawn on members of a clearinghouse, usually effected at a daily meeting of the members.
7. Mach.a space between two moving parts, left to avoid clashing or to permit relatively free motion.
8. the angle between a face of a cutting tool, as a lathe tool, and the work.
9. Naut. a. the clearing of a ship at a port.
b. Also called clear'ance pa"pers. the official papers certifying this.
10. Med.a test of the excretory function of the kidneys based on the volume of blood that is cleared of a specific substance per minute by renal excretion.