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ākāsānañcāyatanaṁ

ākāsānañcāyatana

nominative singular neuter of ākāsānañcāyatana (noun); optionally analyzed as a contraction/compound form in the technical doctrinal register

1. the sphere of infinite space (one of the four immaterial absorption spheres)
2. the realm of space-consciousness
3. first of the formless absorptions

Built from

• ā — prefix · toward, up to
  Reversal particle; here spatial reach toward infinity.
• kāsa — root · space, ether
  Root √kāś (Sanskrit) means 'to shine, be visible'; ākāsa is the visible expanse.
• a — prefix · not, without
  Privative negation, as in avijjā.
• nañca — stem · bounded, limited
  Related to √nañc; here negated to mean 'unbounded, infinite'.
• ā — prefix · toward, up to
  Again spatial: stretching toward the horizon.
• tan — root · stretch, extend
  √tan 'to spread'; āyatana is 'stretched-out place', i.e., sphere or base.
• a — ending · neuter nominative singular
  Neuter nominative singular ending, marking the sphere as a grammatical object of meditation.

Analysis. ākāsa (space) + anañca (infinite, boundless) + āyatana (sphere, base, realm). In canonical Pali this is often written as two words (ākāsānañcāyatanaṁ or ākāsa-anañcāyatana) but functions as a single doctrinal term. The contraction shows haplology: ākāsa + anañcāyatana > ākāsānañcāyatana, with elision of the redundant -a- at the morpheme boundary.

Etymology. ākāsa (< *ā-kāś-, "space, ether") + anañca (a + nañca, "not limited/bounded") + āyatana (ā + √tan, "stretched out place, base, realm"). The compound names the first of four formless meditative attainments (arūpajjhāna), where consciousness extends infinitely through space; in post-canonical Abhidhamma systematics, each becomes a distinct āyatana. Cognate with Sanskrit ākāśa.

Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.

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