as·sur·ance

[uhshooruhns, –shur]

noun

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.