past participle (accusative singular neuter) of pariññāti; literally 'understood thoroughly'
Analysis. pari- (around, all the way round) + ñāta (known, from √ñā 'to know'): 'known completely around', hence 'thoroughly understood' in the sense of full penetrative knowledge of a phenomenon in all its aspects.
Etymology. √ñā 'to know' is cognate with English 'know' and Sanskrit jñā (from PIE *ǵneh₃- 'to know'). The prefix pari- ('around, complete') combines with it to denote the comprehensive, all-sided understanding characteristic of Buddhist wisdom (pariññā).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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