Etymology
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pertinacity (n.)

"resolute or unyielding adherence," c. 1500, from French pertinacité (early 15c.), from Old French pertinace "obstinate, stubborn," from Latin pertinacem (nominative pertinax) "very firm, tenacious, steadfast, persevering," from per "very" (see per) + tenax (see tenacious). It drove out earlier pertinacy (late 14c.), which was especially "persevering in disbelief."

updated on December 07, 2020

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Definitions of pertinacity from WordNet

pertinacity (n.)
persistent determination;
Synonyms: doggedness / perseverance / persistence / persistency / tenacity / tenaciousness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.