1. 
   sixthly
   [adv] - in the sixth place
   Found op http://www.webdictionary.co.uk/definition.php?query=sixthly
   
   
2. 
   Sixthly
   Sixth'ly adverb In the sixth place. Bacon.
   Found op http://www.encyclo.co.uk/webster/S/111
   
   
3. 
   sixthly
   adverb in the sixth place; `sixthly, we cannot afford a vacation`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=sixthly
   
   
4. 
   Sixthly
   • (adv.) In the sixth place.
   Found op http://thinkexist.com/dictionary/meaning/sixthly/
   
   
5. 
   sixthly
   1) In the sixth place
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/sixthly/1
   
   

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