nt dat sg of tathatta (noun); masc dat sg of tathatta (noun)
Analysis. tathatta is the abstract noun derived from tatha (such, in that manner) with the suffix -tta (forming abstracts from adjectives and adverbs); tathattāya as dative or instrumental expresses purpose or manner, 'in order to be/act in such a way' or 'for the sake of such-ness'.
Etymology. tatha is an old demonstrative adverb related to Sanskrit tathā, from the same Indo-European root as English 'that' and Greek to (the article); the suffix -tta (Sanskrit -tva) nominalizes qualities and states, cognate with English '-th' in abstract nouns like 'truth' and 'growth'. The word centers on the concrete idea of 'pointing to a place or manner' (tath-) which becomes abstract identity or truthfulness.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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