What is the definition or description of: alcoholic liver disease?

Definition provided: Alcohol is absorbed from the intestines and broken down in the liver. Some of the byproducts are toxic to the liver and at high enough levels, can lead to alcoholic hepatitis. This is usually self limiting when consumption is low and sporadic and is reversible. When taken excessively and chronically, it can lead to scarring of the liver, and in some cases lead to cirrhosis and liver failure.

Multiple diseases: This is more complex than can be answered here. The effect of alcohol on the liver can be acute causing alcoholic hepatitis to more chronic forms that cause fatty liver infiltration( steatohepatitis) to long term scarring and damage as in cirrhosis which can be life threatening.