0 a very strong interest in something that fills a person's mind or uses up all their time: --
1 a state in which someone directs all their attention to one particular thing: --
She's always cleaning - it's like a mania with her.
Van Gogh suffered from acute persecution mania.
2 a very strong interest in the stated thing, especially among a large group of people: --
3 a unusually strong and continuing interest in an activity or subject: --
4 a mental illness that causes a person to be in a state of extreme physical and mental activity --