accusative singular masculine of vitakka (noun)
Analysis. vi- (apart, in different directions) + takka (thought, reasoning); lit. 'thought scattered in different directions', hence concentrated mental application toward an object.
Etymology. vi- (apart) + √takk- (to think, reason); related to Sanskrit tarka 'reasoning' and perhaps to English 'talk'. The prefix vi- here suggests the mind's directed attention rather than distraction.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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