Source : Webster's Revised Unabridged Dictionary (1913)

Obscurantism \Ob*scur"ant*ism\, n.
   The system or the principles of the obscurants. --C.
   Kingsley.

Source : WordNet®

obscurantism
     n 1: a policy of opposition to enlightenment or the spread of
          knowledge
     2: a deliberate act intended to make something obscure