What is Conviction ?
Conviction is (noun) 1. the fact of being found guilty His lawyers are appealing against his conviction. 2. the fact of being certain that something is true It was a common conviction in the Middle Ages that the earth was flat. Her religious convictions do not allow her to eat shellfish. 3. the fact of being likely or being convincing She gave a string of excuses which completely lacked conviction.
source: Easier English, Student Dictionary Upper Intermediate Level