accusative singular neuter of viññātamatta (adjective/substantive). Surface form: viññātamattaṁ
Analysis. viññāta (past participle of viññānati, 'known') + matta ('merely, only'). Literally 'known-only' or 'knowing-only': the limiting of experience to the bare cognitive act, stripped of conceptual elaboration or craving.
Etymology. From vi- (apart, clarity) + √ñā (to know, cognate with Latin nōscere, English know): viññāna 'consciousness' as clear, distinct knowing. The suffix -matta (from mā 'measure') means 'only, merely', like English '-mere'. Together the phrase expresses a doctrinal abstraction: cognition in isolation from its object and the knower's craving.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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