adjective (accusative singular masculine), or adverb
Analysis. ajjhatta = adhi + atta, 'on top of oneself' or 'presiding over oneself', hence inward and interior. The word became a standard doctrinal term for the first-person perspective in meditation and observation of phenomena.
Etymology. adhi ('on top of, presiding') + atta ('self'), a spatial prefix marking superiority or internality applied to the reflexive pronoun. The compound shifts from literal 'on oneself' to the interior subjective standpoint.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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