The third basket of the Tripitaka canon, the reorganization of all doctrines in a systematic way. The Abhidhamma Pitaka (abhidhammapiṭaka) is the last of the three pitakas (Pali for "baskets") constituting the Pali Canon, the scriptures of Theravāda Buddhism.
The Abhidhamma Pitaka is a detailed scholastic reworking of material appearing in the Suttas, according to schematic classifications. It does not contain systematic philosophical treatises, but summaries or enumerated lists.
The other two collections are the Sutta Pitaka and the Vinaya Pitaka.