mon·o·ma·ni·a 
(mŏn′ə-mānē-ə, -mānyə)
(mŏn′ə-mānē-ə, -mānyə)n.
1. Pathological obsession with one idea or subject.
2. Intent concentration on or exaggerated enthusiasm for a single subject or idea.
mon′o·mani·ac′ (-mānē-ăk′) n.
mon′o·ma·nia·cal (-mə-nīə-kəl) adj.
mon′o·ma·nia·cal·ly adv.
- onerousness
- oneself
- one-shot
- one-sided
- one-sidedly
- one-sidedness
- Onesies
- one-size-fits-all
- (one's) level best
- one's level best
- (one's) lips are sealed
- one's lips are sealed
- (one's) own man
- one's own man
- (one's) own woman
- one's own woman
- one's self
- one-step
- one-stop
- (one's) type
- one's type
- one-time
- one-time pad
- one-timer
- one-to-one