1. 
   HAA
   abbreviation: Height Above Airport/Aerodrome, also, High Angle of Attack
   Found op http://www.apscharts.com/abbrev.html
   
   
2. 
   HAA
   Type: Abbreviation Definitions: 1. Abbreviation for hepatitis-associated antigen.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=38961
   
   
3. 
   HAA
   2-axle coal hopper wagon traditionally used on MGR trains. Similar types include HCA, HMA.
   Found op http://www.scot-rail.co.uk/page/Glossary
   
   
4. 
   haa
   1) Den ... (dutch capital)
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/haa/1
   
   

Tip: double click on a word to show its meaning.