1. 
   TRA
   abbreviation: Temporary Reserved Airspace
   Found op http://www.apscharts.com/abbrev.html
   
   
2. 
   TrA
   The constellation Triangulum Australis The Southern Triangle Trianguli Australis. Genitive name: 110. Visibility: Never visible from the UK. See TABLE 20: THE CONSTELLATIONS.
   Found op http://www.delscope.demon.co.uk/astronomy/tables02.htm
   
   
3. 
   TRA
   TRA is a three-letter abbreviation that can refer to: ...
   Found op http://en.wikipedia.org/wiki/TRA
   
   
4. 
   TRA
   [baseball statistic] tRA is a baseball statistic used to measure the performance of a pitcher. Similar to FIP, tRA uses a mathematical formula to isolate the pitcher from his defense. Thus, tRA is a defense-independent pitching statistic. Unlike FIP and dERA, however, tRA takes into account ...
   Found op http://en.wikipedia.org/wiki/TRA_(baseball_statistic)
   
   
5. 
   tra
   1)
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/tra/1
   
   

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