Pāli Dictionary
doctrine
不可能なこと；余地のないこと；機会のなきこと（しばしば aṭṭhānam etaṃ anavakāso の句で「これは不可能である」と用いられる）
impossibility; inconceivability; what is out of the question (frequently used in the stock phrase aṭṭhānam etaṃ anavakāso, ‘this is impossible, inconceivable’)
Ud 5.5
aṭṭhānam'etaṃ, bhikkhave, anavakāso yaṃ tathāgato aparisuddhāya parisāya uposathaṃ kareyya, pātimokkhaṃ uddiseyya
MN 29
so tena ñāṇadassanena na majjati nappamajjati na pamādaṃ āpajjati, appamatto samāno asamayavimokkhaṃ ārādheti. aṭṭhānam'etaṃ, bhikkhave, anavakāso yaṃ so bhikkhu tāya asamayavimuttiyā parihāyetha.
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