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persevere

/ˌpɜːsəˈvɪə/ verb

In Latin: persevērō Wiktionary

Origin

From Middle English perseveren, from Old French perseverer, from Latin persevērāre (“to continue steadfastly, persist, persevere”), from perseverus (“very strict or earnest”), from per (“through, by the means of”) + severus (“strict, earnest”). Doublet of perseverate.

From Wiktionary, via Kaikki.org (CC BY-SA)