accusative singular neuter of saka (possessive adjective)
Analysis. saka is a possessive adjective formed from the reflexive pronoun stem sa-; sakaṁ is its accusative singular neuter form, used attributively or predicatively to mark something as one's own or proper to a person.
Etymology. From the reflexive pronoun sa- (self, own), cognate with Sanskrit sva- and English self, same; the -ka suffix is a common Pali possessive formation.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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