clearance

clear·ance

noun \ˈklir-ən(t)s\

Definition of CLEARANCE

1

: an act or process of clearing: as a : the removal of buildings from an area (as a city slum) b : the act of clearing a ship at the customhouse; also : the papers showing that a ship has cleared c : the offsetting of checks and other claims among banks through a clearinghouse d : certification as clear of objection : authorization <security clearance> e : a sale to clear out stock f : authorization for an aircraft to proceed especially with a specified action <clearance to land>

2

: the distance by which one object clears another or the clear space between them

3

: the volume of blood or plasma that can be freed of a specified constituent in a specified time by its excretion into the urine through the kidneys <a creatine clearance of 25 milliliters per minute> —called also renal clearance

Examples of CLEARANCE

1. She has a security clearance that allows her to see the classified information.
2. The pilot got clearance to land.
3. That flight has not received clearance for landing.
4. There was only 10 inches of clearance between the car and the side of the tunnel.
5. a bridge with a 100-foot clearance above the water
6. the clearance of forests for farming
7. slum clearance to make room for new housing

First Known Use of CLEARANCE

1540

Related to CLEARANCE

Synonyms: allowance, authorization, permission, concurrence, consent, granting, green light, leave, license (or licence), sanction, sufferance, warrant

Antonyms: interdiction, prohibition, proscription

Related Words: imprimatur, seal, signature, stamp; accreditation, certification; liberty, pass; concession, patent, permit; tolerance, toleration; acceptance, acquiescence, agreement, assent, OK (or okay); accord, grant

Near Antonyms: denial, refusal, rejection, revocation; taboo (also tabu); injunction, veto; deterrence, discouragement, repression, suppression; ban, embargo, exclusion

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Other Aeronautics/Aerospace Terms

airway, apron, corridor, dirigible, fishtail, flat-hat, vector