belief

Mental acceptance of a claim as true.

“It's my belief that the thief is somebody known to us.”

Faith or trust in the reality of something; often based upon one's own reasoning, trust in a claim, desire of actuality, and/or evidence considered.

“Based on this data, it is our belief that X does not occur.”

Something believed.

“The ancient people have a belief in many deities.”

The quality or state of believing.

“My belief that it will rain tomorrow is strong.”

Religious faith.

“She often said it was her belief that carried her through the hard times.”

(in the plural) One's religious or moral convictions.

“I don't want to do a no-fault divorce on my husband and steal from him under color of law. It's against my beliefs.”