The Collaborative International Dictionary of English v.0.48:

Bail \Bail\, n. [OF. bail, baille. See Bailey.]
   1. (Usually pl.) A line of palisades serving as an exterior
      defense. [Written also bayle.] [Obs.]
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   2. The outer wall of a feudal castle. Hence: The space
      inclosed by it; the outer court. --Holinshed.
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   3. A certain limit within a forest. [Eng.]
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   4. A division for the stalls of an open stable.
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   5. (Cricket) The top or cross piece (or either of the two
      cross pieces) of the wicket.
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