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Analysis. aññ- (neuter accusative singular of añña, 'other') + -tra (locative suffix meaning 'in the place of'). Literally 'in the place of other', hence 'elsewhere' or 'apart from'.
Etymology. añña 'other' derives from Proto-Indo-European *h₂ent- 'facing, opposite' (cognate with Sanskrit anya, Latin ante 'before', English anti-). The suffix -tra forms locatives (as in tatra 'there', yatra 'where'); -tra itself likely derives from a root meaning 'to cross' or 'to pass through', giving the spatial sense 'in the direction of, in the place of'.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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