1. 
   summational
   [adj] - of or relating to a summation or produced by summation
   Found op http://www.webdictionary.co.uk/definition.php?query=summational
   
   
2. 
   summational
   summative adjective of or relating to a summation or produced by summation
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=summational
   
   
3. 
   summational
   1) Additive 2) Of or relating to a summation or produced by summation 3) Summative
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/summational/1
   
   

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