Synonyms for Persistence (same or very similar meaning)
WordNet sense 1 (the property of a continuous and connected period of time):
continuityWordNet sense 2 (persistent determination):
doggedness, perseverance, pertinacity, tenaciousness, tenacity, persistencyWordNet sense 3 (the act of persisting or persevering; continuing or repeating behavior):
perseverationFrom the ODE community, based on WordNetadd/edit