1. 
   Forebuilding
   An extension to the keep, guarding it's entrance.
   Found op http://www.encyclo.co.uk/local/20018
   
   
2. 
   Forebuilding
   structure on the outside wall of a great tower or keep, protecting the entrance and all, or part, of the approaching staircase. Some forebuildings contained chambers and chapels over the stairs
   Found op http://www.castlexplorer.co.uk/glossary.php
   
   
3. 
   forebuilding
   projecting defensive work screening entrance of keep or other structure from direct attack
   Found op http://www.castles-of-britain.com/glossary.htm
   
   
4. 
   forebuilding
   1) An extension to the keep, guarding it's entrance
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/forebuilding/1
   
   

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