a.  1.  One more than five; twice three;
 
n.  1.  The number greater by a unit than five; the sum of three and three; six units or objects.  
2.  A symbol representing six units, as 6, vi., or VI.

Noun  1.  six  the cardinal number that is the sum of five and one 
Adj.  1.  six  denoting a quantity consisting of six items or units 