/ ˌpɜːsɪˈvɪərəns; NAmE ˌpɜːrsəˈvɪr-/ noun
[ U ] ( approving ) the quality of continuing to try to achieve a particular aim despite difficulties :
They showed great perseverance in the face of difficulty.
The only way to improve is through hard work and dogged perseverance.
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WORD ORIGIN
Middle English : from Old French , from Latin perseverantia , from perseverant- abiding by strictly, from the verb perseverare , from perseverus very strict, from per- thoroughly + severus severe.