Main Entry: ob·ses·sion

Pronunciation: \äb-ˈse-shən, əb-\

Function: noun

Date: 1680

1 : a persistent disturbing preoccupation with an often unreasonable idea or feeling; broadly : compelling motivation <an obsession with profits>
2 : something that causes an obsession

— ob·ses·sion·al \-ˈsesh-nəl, -ˈse-shə-n^əl\ adjective

— ob·ses·sion·al·ly adverb