- clearance - the distance by which one thing clears another; the space between them
--1 is a kind of interval, separation
Derived form: verb clear9
- headroom, headway, clearance - vertical space available to allow easy passage under something
--2 is a kind of room, way, elbow room
- clearance - permission to proceed; "the plane was given clearance to land"
--3 is a kind of license, permission, permit
Derived form: verb clear4