The quality, capability, or power to elicit belief: "America's credibility must not be squandered, especially by its leaders” ( Henry A. Kissinger).
A capacity for belief: a story that strained our credibility.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.