Pronunciation: (u-shoor'uns, -shûr'-),[key] —n. 1. a positive declaration intended to give confidence: He received assurances of support for the project. 2. promise or pledge; guaranty; surety: He gave his assurance that the job would be done. 3. full confidence; freedom from doubt; certainty: to act in the assurance of success. 4. freedom from timidity; self-confidence; belief in one's abilities: She acted with speed and assurance. 5. presumptuous boldness; impudence.
6. Chiefly Brit.insurance.