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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."
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Definitions of pertinacity from WordNet
Dictionary entries near pertinacity
persuasion
persuasive
pert
pertain
pertinacious
pertinacity
pertinence
pertinency
pertinent
perturb
perturbate