Sunday's term was repudiation, which is defined as:
n. denial of the existence of a contract and/or refusal to perform a contract obligation. Repudiation is an anticipatory breach of a contract. See also: contract anticipatory breach.
Slickdpdx's guess was close, although limited to the criminal context.
Taday's term is:
writ of coram nobis.
Good luck, and no dictionaries, please.