Definition - the forbidding by law of the manufacture, transportation, and sale of alcoholic liquors except for medicinal and sacramental purposes
Prohibition was a period from 1920 to 1933 during which there was a nationwide prevention of the manufacture, sale, or transportation of alcoholic beverages in the United States. It began with the 18th Amendment to the U.S. Constitution, and lasted until the ratification of the 21st Amendment (although some states had been dry before the 18th, and some remained so after the 21st). Although Prohibition is commonly associated with this turbulent period in U.S. history (and is usually capitalized in this sense), the word had been around for many centuries before this; it dates to the 14th century, initially with the meaning of “the act of prohibiting by authority”. The word for someone who favors prohibition is prohibitionist.
I have no language too condemnatory for it, and I would be glad if there were not a saloon in the whole country, but when we adopt prohibition we fly to still greater evils and we won’t stop anybody from drinking whisky either.
— Fort Worth Daily Gazette (Fort Worth, TX) 24 Aug. 1895