An irrational need or irresistible urge to perform some action, often despite negative consequences.
The use of authority, influence, or other power to force (compel) a person or persons to act.
The lawful use of violence (i.e. by the administration).
A complete obsession or absorption in a subject or hobby to a point where a person appears to completely tune out their surroundings and where the person repeatedly returns to said subject or material.