As a Noun: 1. The idea or feeling that something is true. English = belief. 2. A strong belief that something is true, especially something religious. English = conviction, faith. 3. The belief and confidence that you have that someone is honest and will not deliberately do anything to harm you. English = trust. 4. A set of beliefs, principles, or opinions that strongly influence the way people live or work. English = creed, faith. As a Verb or Adjective: 1. To think that something is true. English = believe. 2. To strongly believe that something is true, especially something religious. English = (be) convinced of, have faith in. 3. To believe that someone is telling the truth and is honest and will not deliberately do anything to harm you. English = trust.