masc dat sg of tathāgata (noun); masc gen sg of tathāgata (noun)
Analysis. tathā + āgata: tathā 'in such a manner, thus' (from ta- 'that' + -thā locative adverbial suffix) + āgata 'gone, come' (ā- 'toward' + gata 'gone', past participle of √gam 'go'). Compound epithet: 'one who has come thus', understood as 'one who has arrived at the truth in the way taught' or 'the Thus-Gone One'.
Etymology. āgata from ā- (reversal prefix, 'toward the speaker') + √gam 'go' (cognate with English *come, Latin venīre, Greek *bainō; PIE *gʰem- 'to go'). The prefix ā turns the motion outward: 'has come' (to us, to this point). tathā from proto-Pali *tat-thā, where ta- is the distal demonstrative 'that' and -thā is an old locative adverbial ending; the whole phrase 'in that manner' becomes a characterization meaning 'thus, such'.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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