— obsessional , adj.
/euhb sesh"euhn/ , n.
1. the domination of one's thoughts or feelings by a persistent idea, image, desire, etc.
2. the idea, image, desire, feeling, etc., itself.
3. the state of being obsessed.
4. the act of obsessing.
[ 1505-15; obsession- (s. of obsessio ) blockade, siege, equiv. to obsess ( us ) (see OBSESS) + -ion- -ION ]