pronoun, nominative singular masculine
Analysis. aññatara + iti; a compound of the indefinite pronoun aññatara ("a certain") and the particle iti ("thus, so"). The -iti ending converts the pronoun into an adverbial or emphatic form meaning "thus a certain one" or "in a certain way".
Etymology. aññatara is formed from añña ("other, different") + tara (comparative suffix). The root añña derives from Indo-European *an- ("not, other"), cognate with English "any" and Latin "alius" ("other"); the suffix -tara marks comparative degree, related to Sanskrit -tara and English "-er". The particle iti ("thus, so") is Indo-European *i-ti, related to Latin "it" and the English demonstrative "it".
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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