To forbid; to prohibit or debar; as, to interdict intercourse with foreign nations.
- To prohibit or place under an ecclesiastical or legal sanction.
- To forbid or debar, especially authoritatively. See Synonyms at forbid.
- To cut or destroy (a line of communication) by firepower so as to halt an enemy's advance.
- To confront and halt the activities, advance, or entry of: "the role of the FBI in interdicting spies attempting to pass US secrets to the Soviet Union” ( Christian Science Monitor).
- Law A prohibition by court order.
- Roman Catholic Church An ecclesiastical censure that excludes a person or district from participation in most sacraments and from Christian burial.