A repeal is the removal or reversal of a law. This is generally done when a law is no longer effective, or it is shown that a law is having far more negative consequences than were originally envisioned.
Repeal was a demand by Irish nationalist leader Daniel O'Connell (6 August 1775 — 15 May 1847) for the repeal of the Act of Union 1800 which had merged the Kingdom of Great Britain and Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland in 1801. He wanted to see the re-establishment of the Kingdom of Ireland as a separate legal entity, with its own parliament and government, sharing only a joint monarch with Britain. Ireland's kingdom was to be equal to Britain; a similar equality would exist with both their parliaments.