fem gen sg of eka (card); fem gen sg of eka (adj)
Analysis. ekissāya = eka (one) + issāya (suffix forming abstract noun meaning 'sake, purpose'). The -issāya suffix derives from instrumental issa (from eka) meaning 'for the sake of, on account of'; thus literally 'for the sake of one' or 'for one purpose'.
Etymology. Eka descends from Proto-Indo-European *oikos 'one', cognate with Greek oîkos 'house, household' (via semantic shift 'a single unit'), Latin ūnus 'one' (via syncope), and English one. The suffix -issāya contains the old instrumental instrumental singular issa (from eka itself) + -āya, creating abstract nouns denoting purpose or reason.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version