per·sis·tence 
/pɚˈsɪstəns/ noun
/pɚˈsɪstəns/ noun [noncount] 1 : the quality that allows someone to continue doing something or trying to do something even though it is difficult or opposed by other people
▪ He admired her dogged persistence in pursuing the job. ▪ His persistence in asking for a raise was finally rewarded. ▪ She has shown a lot of persistence. 2 : the state of occurring or existing beyond the usual, expected, or normal time — usually + of ▪ The persistence of the rash worried him.
▪ He admired her dogged persistence in pursuing the job. ▪ His persistence in asking for a raise was finally rewarded. ▪ She has shown a lot of persistence.
