1. 
   tightening
   [n] - the act of making something tighter
   Found op http://www.webdictionary.co.uk/definition.php?query=tightening
   
   
2. 
   tightening
   noun the act of making something tighter; `the tightening of economic controls`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=tightening
   
   
3. 
   Tightening
   • (p. pr. & vb. n.) of Tighten
   Found op http://thinkexist.com/dictionary/meaning/tightening/
   
   
4. 
   tightening
   
   1. the act of making something tighter
   2. make tight or tighter
   3. become tight or tighter
   4. restrict
   5. narrow or limit
   
   Found op
   
   
5. 
   tightening
   1) Adjustment 2) Alteration 3) Modification 4) The act of making something tighter
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/tightening/1
   
   

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