Pronunciation: (hwâr'wi&thslash;-ôl", -with-, wâr'-), [key]
that with which to do something; means or supplies for the purpose or need, esp. money: the wherewithal to pay my rent.
1. by means of which; out of which.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.