1. The outer wall of a castle.
2. The space enclosed by this outer wall.

[Middle English bailli, from Old French baille, probably from Latin bacula, pl. of baculum, log, stick. See bacillus.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.