masculine nominative singular; a noun compound
Analysis. kiṁ (interrogative pronoun 'what') + pabhavo (becoming, origin, from √bhavati 'to become'). The compound asks 'what is the mode of arising?' — a standard doctrinal question about the nature and cause of phenomena.
Etymology. kiṁ derives from the Indo-European interrogative *kwo-; pabhavo is pa- (forward, forth) + bhavo (state of being, from √bhavati 'to become'), so literally 'becoming that comes forth.' √bhavati is cognate with English 'be', Latin 'fui', Sanskrit 'bhavati'.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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