What does clearance mean?
"Clearance" is a versatile English noun denoting both the act of clearing something away and the authorization granted to move forward. In its most familiar modern sense, it refers to official permission — a security clearance allows access to classified information, while air traffic control grants an aircraft clearance for takeoff. The word also describes the physical act of removing obstacles or unwanted goods, which gives rise to its widespread commercial use: a "clearance sale" is a discount event held to dispose of remaining stock quickly. Additionally, clearance can mean a measured gap or space between two objects, as when engineers check the clearance beneath a bridge for tall vehicles. Derived from Latin roots meaning "to make bright or clear," the word carries connotations of openness, resolution, and approval. Its range across bureaucratic, commercial, technical, and everyday language makes it an indispensable term in contemporary English.
Official authorization or permission to proceed with an action.
"The diplomat required government clearance before entering the restricted zone."
The act of removing or disposing of items, people, or obstacles.
"The clearance of debris took several days after the storm."
A sale of goods at reduced prices to eliminate excess stock.
"Everything in the winter coat section is on clearance this week."
The distance or gap between two objects, especially in engineering or transport contexts.
"The truck barely fit under the bridge, with only inches of clearance."
Used when referring to multiple instances of authorization or multiple measured gaps.
"All personnel must submit their clearances before accessing the facility."
From medieval markets to airport control towers, one word has always meant the same thing: permission to proceed.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of clearance
"Clearance" derives from the verb "clear," which traces back through Old French "cler" to Latin "clarus," meaning bright, clear, or illustrious. Related words sharing this root include "clarify," "declare," and "clarity." As English developed, "clear" expanded beyond describing visual transparency to encompass the removal of obstructions and the granting of approval. The noun "clearance" emerged from these uses, solidifying in English by at least the early modern period and diversifying into senses covering authorization, disposal, and spatial measurement.
How clearance is actually used
Common in formal and administrative contexts (security vetting, customs procedures) as well as in commercial retail language. In British usage, "clearance" is frequently associated with sales and discounted stock; in American usage it appears heavily in legal, aviation, and governmental contexts.
Easily confused with clearance
"Clearing" refers to an open space in a forest or the act of clearing land, while "clearance" more broadly covers removal, authorization, and physical gaps between objects.