1. 
   hac
   Latin, meaning: (fem. sing. abl.) He who lives BY THIS (the sword),...
   Found op http://archives.nd.edu/hhh.htm
   
   
2. 
   hac
   Latin, meaning: this side, this way, here.
   Found op http://archives.nd.edu/hhh.htm
   
   
3. 
   HAC
   Hydro Abrasive Cutting
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   HAC
   French helicopter program [FR]
   Found op http://www.jedsite.info/index.html
   
   
5. 
   HAC
   (initial) A Heavy Assault Ships class ship.
   Found op http://wiki.eveonline.com/en/wiki/Glossary
   
   

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