nominative singular neuter of kiñci (indefinite pronoun); the form kiñcetaṁ is a contraction (kiñci + etaṁ)
Analysis. kiñci (indefinite pronoun 'something') + etaṁ (demonstrative pronoun 'this/that'); the contraction forms an emphatic or identificatory phrase: 'this something', 'a certain thing', often used to introduce or refer back to a particular item or point.
Etymology. kiñci is related to Sanskrit kiṁ 'what' (cognate with English who, Latin quis, Greek tis); the demonstrative etaṁ derives from the stem e- (pronoun), with the -taṁ neuter nominative/accusative singular ending.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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