Grammatical Analysis
Arūpajhāna: [nt.] immaterial absorption; formless attainment. Formed by arūpa (formless, immaterial) + jhāna (meditative absorption).
Orthodox Definition
The Arūpajhānas are the four highest states of meditative absorption (samatha), operating entirely beyond the perception of physical matter (rūpa-saññā).
While the four lower rūpajhānas (fine-material absorptions) are based on physical counterparts like light or colored discs, the arūpajhānas are based on infinite, formless concepts. To attain them, a meditator must first reach the fourth material jhāna, find even that state gross because it still relies on a material sign, and completely withdraw their attention from the concept of matter.
The four immaterial states are:
- The Base of Infinite Space (Ākāsānañcāyatana).
- The Base of Infinite Consciousness (Viññāṇañcāyatana).
- The Base of Nothingness (Ākiñcaññāyatana).
- The Base of Neither-Perception-Nor-Non-Perception (Nevasaññānāsaññāyatana).
Because they share the exact same mental factors as the fourth fine-material jhāna (equanimity and one-pointedness), the Abhidhamma technically categorizes them simply as refined variants of the fourth jhāna.
Textual References
- Sutta: Ariyapariyesanā Sutta (MN 26) – The Buddha detailing how he mastered these specific states under his former teachers, Āḷāra Kālāma and Uddaka Rāmaputta, before realizing they do not lead to Nibbāna.
- Abhidhamma: Vibhaṅga (Jhānavibhaṅga chapter).
- Commentary: Visuddhimagga (Chapter X) – The absolute master manual detailing the precise psychological shifts required to transcend form.