1. Public skepticism about the truth of statements, especially official claims and pronouncements: "The credibility gap [is] the result of a deliberate policy of artificial manipulation of official news" (Walter Lippmann).
2. Lack of trustworthiness.
3. A discrepancy or disparity, especially between words and actions.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.