Definitions of clearance
  1. noun
    vertical space available to allow easy passage under something
    synonyms: headroom, headway
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    type of:
    elbow room, room, way
    space for movement
  2. noun
    the distance by which one thing clears another; the space between them
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    type of:
    interval, separation
    the distance between things
  3. noun
    permission to proceed
    “the plane was given clearance to land”
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    type of:
    license, permission, permit
    the act of giving a formal (usually written) authorization
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