Reassurance (noun)

1. The act of reassuring or giving confidence to someone.
2. The state of being reassured.
3. A statement or action that makes someone feel more confident or certain about something.

Origin:

The word "reassurance" is a combination of the prefix "re-" meaning "again" or "back" and "assurance" which means "the act of making certain or providing confidence". this word came into use in the 18th century.

Examples:

1. She needed reassurance that she had made the right decision.
2. His reassurance was all she needed to feel better about the situation.
3. The doctor's reassurance that everything was going to be alright helped to put her mind at ease.
4. The reassurance from her friend that she was not alone in her struggles was a great comfort to her.
5. The reassurance of a steady income was a big factor in their decision to buy a house.