The Collaborative International Dictionary of English v.0.48:
Obscurantism \Ob*scur"ant*ism\, n. The system or the principles of the obscurants. --C. Kingsley. [1913 Webster]WordNet (r) 3.0 (2006):
obscurantism n 1: a policy of opposition to enlightenment or the spread of knowledge 2: a deliberate act intended to make something obscure