Etymology
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obscurantism (n.)

"opposition to the advancement and diffusion of knowledge, a desire to prevent inquiry or enlightenment," 1801, from German obscurantism, obscurantismus (by 1798); see obscurant + -ism.

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Definitions of obscurantism

obscurantism (n.)
a policy of opposition to enlightenment or the spread of knowledge;
obscurantism (n.)
a deliberate act intended to make something obscure;
From wordnet.princeton.edu