Conviction (noun)

1. A formal declaration that someone is guilty of a criminal offense, made by a judge or jury after a trial.
2. A firmly held belief or opinion.
3. The state of being convinced of the truth or existence of something.

Origin:

From middle english, from old french conviction, from latin convictio, from convincere ("to prove guilty, convict"), from con- ("completely") + vincere ("to conque.r")

Examples:

1. He was found guilty of the crime and received a conviction.
2. She had a conviction that she could succeed.
3. The conviction that he was right was unshakable.
4. The evidence led to a conviction in the case.
5. His conviction in his faith was admirable.