The Collaborative International Dictionary
Perdurance
Perdurance \Per*dur"ance\ (p[~e]r*d[=u]r"ans), Perduration \Per`du*ra"tion\ (p[~e]r`d[-u]*r[=a]"sh[u^]n), n. Long continuance. [Archaic]
Wiktionary
perdurance
n. permanence, persistence