[ ˌɒbskjʊ'rantɪz(ə)m ]
■ noun the practice of preventing the facts or full details of something from becoming known.
Derivatives
obscurant noun & adjective
obscurantist noun & adjective
Origin
C19: from earlier obscurant , denoting a person who obscures something, via Ger. from L. obscurant- , obscurare 'make dark'.