accusative singular feminine of arati (noun)
Analysis. a- (not) + rati (delight, pleasure); hence literally 'non-delight'.
Etymology. Formed with the negating prefix a- from rati, 'delight' or 'satisfaction' (Sanskrit rati, from √ram 'to enjoy, rest'). The prefix a- marks the absence or negation of a state. Cognate with English un-, Greek a(n)- (as in anhedonia).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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