wherewith (ad HOK)

adverb: with which
pronoun: the thing(s) with which
conjunction: by means of which

From where + with. Earliest documented use: 1200

Usage (from Wordsmith)
“When a brilliant student completes his work ahead of schedule, he is granted an award of time and means wherewith he may execute some pet project of his own devising.”
The Urantia Book; Urantia; 1955

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