Definition of "Prohibition" :
noun: the action of prohibiting or inhibiting or forbidding (or an instance thereof)
"They were restrained by a prohibition in their charter."
noun: a law forbidding the sale of alcoholic beverages
"In 1920 the 18th amendment to the Constitution established prohibition in the US."
noun: a decree that prohibits something
noun: refusal to approve or assent to
noun: the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment