1. 
   horizontality
   [n] - the quality of being parallel to the horizon
   Found op http://www.webdictionary.co.uk/definition.php?query=horizontality
   
   
2. 
   Horizontality
   Hor`i·zon·tal'i·ty noun [ Confer French horizontalité .] The state or quality of being horizontal. Kirwan.
   Found op http://www.encyclo.co.uk/webster/H/61
   
   
3. 
   horizontality
   noun the quality of being parallel to the horizon; `houses with a pronounced horizontality`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=horizontality
   
   
4. 
   Horizontality
   • (n.) The state or quality of being horizontal.
   Found op http://thinkexist.com/dictionary/meaning/horizontality/
   
   
5. 
   horizontality
   1) Dead flat 2) Dead level 3) Flatness 4) Level 5) Level plane 6) Plane 7) Position 8) Spatial relation 9) Stratum 10) The quality of being parallel to the horizon
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/horizontality/1
   
   

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