Extraordinary Remedy
The designation given to such writs as HABEAS CORPUS, MANDAMUS, and QUO WARRANTO, determined in special proceedings and granted only where absolutely necessary to protect the legal rights of a party in a particular case, as opposed to the customary relief obtained by the maintenance of an action.
Most states have eliminated extraordinary remedies. The relief formerly provided by them can be sought through an ordinary action.
Additional topics
Law Library - American Law and Legal InformationFree Legal Encyclopedia: Ex proprio motu (ex mero motu) to File