By virtue of

//baɪ ˈvɜːtʃuː ɒv// prep

Definitions

Preposition
  1. 1
    (originally) By the authority or power of; (now) because of; on the grounds of; by reason of. idiomatic

    "Moreouer the perfit beleue of this article, worketh in all true chriſten people, aloue to continue in this vnitie, and afeare to be caſte out of the ſame, and it worketh in them that be ſinners and repentant, great comforte, and conſolacion, to obteine remiſſion of ſinne, by vertue of Chriſtes paſſion, and adminiſtracion of his ſacramentes at the miniſters handes, ordained for that purpoſe, [...]"

Etymology

Modification of Middle English in vertu of, a calque of Anglo-Norman par vertu de or Middle French par la vertu de (“by the authority of”); from Old French vertu (“goodness; honour; valour; virtue”) (whence English virtue (“(obsolete) inherent power of a god or other supernatural being; inherent power or efficacy of something”)).

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