sandhi form of taṃ + eva; demonstrative pronoun (accusative singular neuter) + emphatic particle
Analysis. taṃ (accusative singular neuter of ta, 'that') + eva (emphatic particle 'itself, very, alone'). The sandhi contraction assimilates the final ṃ to the following vowel, yielding taññeva. Common in the canon to emphasize identity or uniqueness: 'that very thing', 'none other than that.'
Etymology. ta descends from Proto-Indo-European *tod- (that, this), cognate with Latin is-te (that one), Greek to (the), English that. eva is an older particle of emphasis and identity, perhaps related to Sanskrit eva and the root *h₁es- (to be).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version