Alcoholism is an addiction. Think of smoking. If someone does it recreationally, they’re teaching their bodies to get used to the nicotine and may have to fight wanting more. So too with drinking.
Momommia: Yes, alcoholism is an addiction. However, it is very different from smoking. Nicotine causes a chemical addiction, while alcohol does not, as I am aware.
In any event, your definition seems pretty correct. But, I drink a beer or two almost every day, and I think it is fine.