mon‧o‧ma‧ni‧a /ˌmɒnəʊˈmeɪniə $ ˌmɑːnoʊ-/
noun [uncountable] formal a very strong interest in one particular idea or subject which prevents you from thinking about anything else:
an obsession with food that verged on monomania—monomaniac /-niæk/
noun [countable] [TahlilGaran] Dictionary of Contemporary English ▲