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pertinacity

[pur-tn-as-i-tee] /ˌpɜr tnˈæs ɪ ti/
noun
1.
the quality of being pertinacious; persistence.
Origin of pertinacity
1495-1505
1495-1505; < Late Latin pertinācitās, for Latin pertinācia stubbornness, perseverance (> obsolete pertinacy), equivalent to pertināci- (stem of pertināx) steadfast, stubborn + -tās -ty2. See per-, tenacity
Synonyms
firmness, determination, resolution. See perseverance.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for pertinacity
n.

c.1500, from Middle 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.).

Online Etymology Dictionary, © 2010 Douglas Harper
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