pronoun
Analysis. aññehi (instrumental plural of añña) + iti (thus, so); the instrumental 'by/with another' plus the quotative particle iti creates an adverbial phrase meaning 'otherwise, in another way' or 'by another means.' The construction shifts a noun-phrase into a modal or conditional sense.
Etymology. Pali añña derives from Sanskrit anya-, from PIE *an-yo- (the negative particle *an- 'not' + the comparative suffix *-yo-), literally 'not-the-same.' The root imagery is negation: what is not this, what is separate. Cognates: English 'other' (from PIE *ant-ero-), Latin alius, Greek allos.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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