Pronunciation: (sub-stan'shē-āt"), [key]
—v.t., -at•ed, -at•ing.
1. to establish by proof or competent evidence: to substantiate a charge.
2. to give substantial existence to: to substantiate an idea through action.
3. to affirm as having substance; give body to; strengthen: to substantiate a friendship.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.