280. Ananto ākāsoti ettha nāssa uppādanto vā vayanto vā paññāyatīti ananto.
Ñ(X,23): Unbounded space: here it is called 'unbounded' (ananta, lit. endless) because neither its end as its arising nor its end as its fall are made known.
Ākāsoti kasiṇugghāṭimākāso vuccati.
Ñ: It is the space left by the removal of the kasina that is called 'space'.
Manasikāravasenāpi cettha anantatā veditabbā.
Ñ: And here unboundedness (endlessness) should be understood as [referring to] the attention also,
Teneva vibhaṅge vuttaṃ ‘‘tasmiṃ ākāse cittaṃ ṭhapeti, saṇṭhapeti, anantaṃ pharati, tena vuccati ananto ākāso’’ti (vibha. 605).
Ñ: which is why it is said in the Vibhaṅga: 'He places, settles, his consciousness in that space, he pervades unboundedly (anantaṃ), hence "unbounded (ananto) space" is said (Vbh. 262).