The Collaborative International Dictionary of English v.0.48:
Reassurance \Re`as*sur"ance\ (r[=e]`[.a]*sh[udd]r"ans), n. 1. Assurance or confirmation renewed or repeated. --Prynne. [1913 Webster] 2. (Law) Same as Reinsurance. [1913 Webster]WordNet (r) 3.0 (2006):
reassurance n 1: the act of reassuring; restoring someone's confidence