assurance

(noun) freedom from doubt; belief in yourself and your abilities. Synonyms: self-assurance, confidence, self-confidence, authority, sureness. Examples: "His assurance in his superiority did not make him popular." "After that failure he lost his confidence." "She spoke with authority."

(noun) a binding commitment to do or give or refrain from something. Synonyms: pledge. Examples: "An assurance of help when needed." "Signed a pledge never to reveal the secret."

(noun) a statement intended to inspire confidence. Example: "The president's assurances were not respected."

(noun) a British term for some kinds of insurance.