masc instr sg of vasa (noun); masc instr sg of vasa (root); masc instr sg of vasa (adj); nt instr sg of vasa (adj)
Analysis. vasena is the instrumental singular form of vasa used as an indeclinable postposition or adverbial marker meaning 'by the power of', 'through', 'by means of', or 'as'. The -ena ending is the regular instrumental singular for masculine nouns and neuter adjectives.
Etymology. vasa derives from √vas (to dwell, wish, have power), cognate with Sanskrit vasa, Avestan vah- (to carry, have), and possibly English wish via Proto-Germanic *wiska-. The sense 'power' develops from 'dwelling' or 'settling' (what settles one's affairs), and the instrumental vasena grammaticalizes into a postposition expressing agency or means, much as English 'with' or 'by' originates in the instrumental case.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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