Pāli Dictionary
general
無色的；無形的；無實體的
formless; immaterial; incorporeal, without physical form
AN 10.13
rūparāgo, arūparāgo, māno, uddhaccaṃ, avijjā, imāni pañc'uddham'bhāgiyāni saṃyojanāni.
DN 33
aparā'pi, tisso taṇhā kāmataṇhā rūpataṇhā arūpataṇhā
doctrine
無色界；無色定（相對於色界而言的無形境界或成就）
the formless state; the formless realm or attainment (as opposed to the realm of form, rūpa)
Snp 3.12
rūpehi, bhikkhave, arūpā santatarā'ti, ayam'ek'ānupassanā. arūpehi nirodho santataro'ti, ayaṃ dutiy'ānupassanā.
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