accusative singular neuter of āciṇṇa (past participle of ācinati, 'to heap up, accumulate')
Analysis. ā + cinati: the prefix ā- (toward, up to) combined with √ci (heap, pile) yields 'accumulated up', hence 'habitual' or 'customary' in the sense of repeated and layered accumulation.
Etymology. √ci 'heap, pile' is related to Sanskrit root ci- (citi 'pile, heap') and possibly to Greek kinein 'to move, stir' in the sense of gathering together. The prefix ā- reverses motion verbs and marks completeness, giving 'heaped together toward a point' or 'fully accumulated'.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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