Doctrine
jhāna
Meditative absorption
Rūpa-jhānas: 1st (vitakka, vicāra, pīti, sukha, ekaggatā), 2nd drops vitakka-vicāra, 3rd drops pīti, 4th replaces sukha with upekkhā. Arūpa-jhānas refine further.
In short
States of deep unification with five (then fewer) factors.