What is ACTIO? Definition of ACTIO in Black's Law Dictionary
Lat. In the civil law. An action or suit; a right or cause of action. It should be noted that this term means both the proceeding to enforce a right in a court and the right itself which is sought to be enforced.
The first sense here given is the older one. Justinian, following Celsus, gives the well-known definition : Actio nihil aliud est quam jus persequendi in judicio quod sibi debetur, which may be thus rendered : An action is simply the right to enforce one's demands in a court of law. See Pollock, Expansion of C. L. 92.
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