obsessional

UK: /əbˈseʃənəl/

WordReference Random House Learner's Dictionary of American English © 2025

ob•ses•sion /əbˈsɛʃən/   n. 

1. [uncountable] the intense preoccupation of one's thoughts by a single, continuous idea or feeling;
   the state of being obsessed.
2. [countable] the idea, image, desire, etc., itself.

See -sess-.

WordReference Random House Unabridged Dictionary of American English © 2025

ob•ses•sion  (əb sesh′ən), 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.

• Latin obsessiōn- (stem of obsessiō) blockade, siege, equivalent. to obsess(us) (see obsess) + -iōn- -ion
• 1505–15

ob•ses′sion•al, adj.