the GNU version of the Collaborative International Dictionary of English
n. Want of loyalty; lack of fidelity; violation of allegiance.
The Century Dictionary and Cyclopedia
n. Want of loyalty; specifically, violation of allegiance or duty to a sovereign, state, or government.
n. Want of fidelity to one's obligations or engagements; inconstancy in duty or in love; faithlessness; perfidy. Spectator.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the quality of being disloyal
Word Usage
"Clearly, disloyalty is not an attribute of Gonzales, who has shown himself willing to perform virtually any task for his “Godfather,” no matter how dishonest or demeaning."