Pronunciation: (in"fi-del'i-tē), [key]
1. marital disloyalty; adultery.
2. unfaithfulness; disloyalty.
3. lack of religious faith, esp. Christian faith.
4. a breach of trust or a disloyal act; transgression.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.