masc nom sg of puññabhāgiya (adj)
Analysis. puñña (merit, wholesome deed) + bhāgiya (sharing in, partaking of); literally 'sharing in merit', i.e. connected with or conducive to merit.
Etymology. puñña is an old neuter noun from √pū (to purify, abound); bhāgiya derives from bhāga (share, portion) + -iya (adjectival suffix forming 'sharing in' or 'partaking of'). The compound fuses two concepts: the accumulation of wholesome action and the recipient's share in its fruit.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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