clearance

Noun
  1. The distance by which one thing clears another;
    The space between them (synset 105097318)
    is a type of: interval, separation - the distance between things
  2. Vertical space available to allow easy passage under something (synset 113800473)
    is a type of: elbow room, room, way - space for movement
    same as: headroom, headway
  3. Permission to proceed (synset 101143914)
    "the plane was given clearance to land"
    is a type of: license, permission, permit - the act of giving a formal (usually written) authorization

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