Answer: In the context of this passage, "persistence" means the quality of continuing to work towards a goal or solution despite facing challenges, setback, or failures. Mary Anderson's persistence refers to her determination to keep experimenting and working on her design for a rain-clearing device even after facing many difficulties. Despite having these obstacles and challenges ahead of her she delved deeper into her passion which eventually lead to the invention of the modern windshield wiper. It was actually a persistence 17 year endeavor but in the early 20's we would see Cadillac use her design as a standard windshield wiper design.