Consuming more than 3 drinks on any day or more than 7 drinks per week, where a drink is 12 fluid ounces of 5% alcohol.

Becoming drunk enough to do things regretted later at least once every four months.

Not being able to resist consuming alcohol when having the urge to do so.

(Stable) Brain changes which lead to: A pattern of things like: cravings for alcohol, control loss, drinking despite negative consequences, tolerance for alcohol, withdrawal symptoms. Its not necessary, to fulfill all symptoms.

Chronically drinking alcohol even when doing so clearly causes problems either immediately or soon thereafter.