clearance

/ˈklɪrəns/

/ˈklɪərəns/

Other forms: clearances

Definitions of clearance

1. noun

   vertical space available to allow easy passage under something
   synonyms: headroom, headway

   type of:

   elbow room, room, way

   space for movement
2. noun

   the distance by which one thing clears another; the space between them
   type of:

   interval, separation

   the distance between things
3. noun

   permission to proceed
   “the plane was given clearance to land”

   type of:

   licence, license, permission, permit

   the act of giving a formal (usually written) authorization