1. An individual sheet of glass in a window.
  2. A layer in the build-up of a GUI.
  3. A division; a distinct piece or compartment of any surface.
  4. A square of a checkered or plaid pattern.
  5. One of the openings in a slashed garment, showing the bright colored silk, or the like, within; hence, the piece of colored or other stuff so shown.
  6. A compartment of a surface, or a flat space; hence, one side or face of a building.
    An octagonal tower is said to have eight panes.
  7. A subdivision of an irrigated surface between a feeder and an outlet drain.
  8. One of the flat surfaces, or facets, of any object having several sides.
  9. One of the eight facets surrounding the table of a brilliant-cut diamond.

The above text is a snippet from Wiktionary: pane
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