n. The act of prohibiting, forbidding, or interdicting; an edict or a decree to forbid or debar.n. In a restricted sense, the interdiction by law of the manufacture and sale of alcoholic drinks, except for medicinal or sacramental uses.n. In Scots law, a technical clause in a deed of entail prohibiting the heir from selling the estate, contracting debt, altering the order of succession, etc. Synonyms Interdiction, inhibition, embargo. See prohibit.