Pronunciation: (ō'vur-kil"), [key]
1. the capacity of a nation to destroy, by nuclear weapons, more of an enemy than would be necessary for a military victory.
2. an instance of such destruction.
3. an excess of what is required or suitable, as because of zeal or misjudgment.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.