The Collaborative International Dictionary of English v.0.48:
lastingness \lastingness\ n. permanence by virtue of the power to resist stress or force. Syn: durability, enduringness, strength. [WordNet 1.5]WordNet (r) 3.0 (2006):
lastingness n 1: permanence by virtue of the power to resist stress or force; "they advertised the durability of their products" [syn: lastingness, durability, enduringness, strength]