"persistence" in the noun sense
1. continuity, persistence
the property of a continuous and connected period of time
2. doggedness, perseverance, persistence, persistency, tenacity, tenaciousness, pertinacity
persistent determination
3. perseverance, persistence, perseveration
the act of persisting or persevering continuing or repeating behavior
"his perseveration continued to the point where it was no longer appropriate"
Source: WordNet® (An amazing lexical database of English)
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