What is Licensing Act?

Legal Definition
Licensing Act (with its variations) is a stock short title used in the United Kingdom for legislation relating to licensing.
-- Wikipedia
Legal Definition
This expression is applied by Hallam (Const. Hist c. 13) to acts of parliament for the restraint of printing, except by license. It may also be applied to any act of parliament passed for the purpose of requiring a license for doing any act whatever. But, generally, when we speak of the licensing acts, we mean the acts regulating the sale of intoxicating liquors. Mozley & Whitley.
-- Black's Law Dictionary