feminine nominative singular of tatratatrābhinandinī (noun); compound form
Analysis. tatratatra (here and there, in each place) + abhinandinī (feminine of abhinandant-, one who delights, from abhi- + nand- to rejoice). The reduplication tatratatra emphasizes distribution across multiple instances.
Etymology. abhinandinī derives from the root nand- (to be glad, rejoice), with the prefix abhi- (toward, toward with intensity). Tatratatra is an adverbial form built on tatra (there, in that place) with reduplication indicating 'each place' or 'respectively'. Cognate with Sanskrit nandati (rejoices).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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