accusative singular of tathā-attā (masculine noun in tatpuruṣa compound); surface form shows contraction and case inflection
Analysis. tathā (adverb, 'thus, as it is') + attā (noun, 'self') in tatpuruṣa compound = 'the self as it truly is'; the accusative singular -aṁ marks this as a direct object or internal accusative in context
Etymology. attā derives from Indo-European *ātman- (Sanskrit ātman, 'breath, self, soul'), cognate with Latin anima 'soul, breath'. The prefix tathā (from ta- 'that' + -thā, an old instrumental) emphasizes 'just as it is, in its true form', turning a simple noun into a philosophical term for authentic identity or self-knowledge as understood in the Buddha's teaching on anattā (non-self) and the proper seeing of phenomena.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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