śikṣā [sikkhā] training. A disciple of the Buddha has to undergo threefold training. Training in morality (adhiśīlam) comprises right speech, right action and right livelihood. Training in concentration (adhicittaṃ) consists of right effort, right mindfulness and right concentration. Training in wisdom (adhiprajñaṃ) consists of right understanding and right thinking. The first corresponds to the Vinaya, the second to the Sutta and the third to the Abhidhamma.

Buddhānusmṛti - A Glossary of Buddhist Terms

Aṭṭhasālinī. Nidāna. 43. Dīgha Nikāya. Saṅgīti. Mahāyāna-Sūtrālaṅkāra. XI. 55.