1. An opening in anything made by breaking or parting.
  2. An opening allowing passage or entrance.
  3. An opening that implies a breach or defect.
  4. A vacant space or time.
  5. A hiatus.
  6. A mountain or hill pass.
  7. A sheltered area of coast between two cliffs (mostly restricted to place names).
  8. The regions between the outfielders.
  9. The shortfall between the amount the medical insurer will pay to the service provider and the scheduled fee for the item.


  1. To notch, as a sword or knife.
  2. To make an opening in; to breach.
  3. To check the size of a gap.
    I gapped all the sparkplugs in my car then realized I used the wrong manual and had made them too small.

The above text is a snippet from Wiktionary: gap
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