What is Prohibition?

Legal Definition
Prohibition is the illegality of the manufacturing, storage in barrels or bottles, transportation, sale, possession, and consumption of alcohol including alcoholic beverages, or a period of time during which such illegality was enforced.
-- Wikipedia
Legal Definition
Practice. The name of a writ issued by a superior court, directed to the judge and parties of a suit in an inferior court, commanding them to cease from the prosecution of the same, upon a suggestion that the cause originally, or some collateral matter arising therein, does not belong to that jurisdiction, but to the cognizance of some other court. 3 Bl. Com. 112; Com. Dig. h. t.; Bac. Ab. h. t. Saund. Index, h. t.; Vin. Ab. h. t.; 2 Sell. Pr. 308; Ayliffe's Parerg. 434; 2 Hen. Bl.

2. The writ of prohibition may also be issued when, having jurisdiction, the court has attempted to proceed by rules differing from those which ought to be observed; Bull. N. P. 219; or when, by the exercise of its jurisdiction, the inferior court would defeat a legal right. 2 Chit. Pr. 355.
-- Bouviers Law Dictionary
Legal Definition
In practice. The name of a writ issued by a superior court, directed to the judge and parties of a suit in an inferior court, commanding them to cease from the prosecution of the same, upon a suggestion that the cause originally or some collateral matter arising therein, does not belong to that jurisdiction, but to the cognizance of some other court. 3 Bl. Comm. 112. The writ of prohibition is the counterpart of the writ of mandate. It arrests the proceedings of any tribunal, corporation, board or person, when such proceedings are without or in excess of the jurisdiction of such tribunal, corporation, board or person. Code Civ. Proc. Cal. ยง 1102. And see Mayo v. James, 12 Grat. (Va.) 23; People v. Judge of Superior Court (Mich.) 2 N. W. 919; State v. Ward, 70 Minn. 58, 72 N. W. 825; Johnston v. Hunter, 50 W. Va. 52, 40 S. E. 448; Appo v. People, 20 N. Y. 531; Hovey v. Elliott, 167 U. S. 409, 17 Sup. Ct 841, 42 In Ed. 215; State v. Evans, 88 Wis. 255, 60 N. W. 433.
-- Black's Law Dictionary
Legal Definition
A writ to prevent an inferior tribunal from usurping a jurisdiction with which it is not legally vested. See 111 Am. St. Rep. 930, note.
-- Ballentine's Law Dictionary