nt (nominative/accusative plural with enclitic api)
Analysis. jātisata (one hundred lives) + api (even, also): 'even a hundred lives', emphasizing the multiplicity of rebirths in saṁsāra; the accusative jātisataṃ takes the enclitic particle api, creating the sense of 'even as many as a hundred lives'.
Etymology. jāti from √jan (to be born, to become; Sanskrit janati, English kin, Latin genus) + sata (hundred, from Proto-Indo-European *kṁtóm; Sanskrit śata, Latin centum, English hundred). The compound denotes a span of rebirths across saṁsāra, a standard measure of temporal vastness in the Canon.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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