Assurance (noun)

1. A statement or action that gives someone confidence or reassurance.
2. A formal guarantee or promise, especially in financial contexts.

Origin:

Late middle english (in the sense "a legal guarantee"): from old french assuraunce, from assurer (see assure).

Examples:

1. He gave her assurance that everything would be alright.
2. The company gave us an assurance of their commitment to customer satisfaction.
3. He gave an assurance of his support.
4. The assurance of the company's financial stability was a major factor in the decision.
5. The assurance of the insurance policy gave them peace of mind.