pr 3rd pl of atthi (verb); fem voc sg of santa (prp); fem nom sg of santi (noun); fem voc sg of santi (noun)
Analysis. Nominalized from santa (pres. part. of atthi 'to be'), meaning literally 'being' or 'that which is'; also analyzed as saṃ + iti 'together + going/being', suggesting coming together into stillness.
Etymology. From √as 'to be' (atthi, āsi, bhavissati in weak grades); cognate with Sanskrit asti, Greek esti, Latin est. The nominal form santi (being, peace) reflects the noun of state from the present participle santa. The prefix saṃ- (together, completeness) may be present etymologically in the sense of 'collected being' or tranquility.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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