1. The distance by which one thing clears another; the space between them 
2. Vertical space available to allow easy passage under something
   - headroom, headway 
3. Permission to proceed
   "the plane was given clearance to land"

Derived forms: clearances

See also: clear

Type of: elbow room, interval, licence [Brit, Cdn], license [N. Amer], permission, permit, room, separation, way

Encyclopedia: Clearance

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