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Noun: clearance  kleer-un(t)s
  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"
  4. Official permission or approval
    "clearance for the program was renewed several times";
    - authority, authorization, authorisation [Brit], sanction
  5. (medicine) the rate of removal of substances from the blood

Derived forms: clearances

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

Encyclopedia: Clearance