pertinacity

[pur-tn-as-i-tee]
noun
the quality of being pertinacious; persistence.

Origin:
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


firmness, determination, resolution. See perseverance.
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World English Dictionary
pertinacious (ˌpɜːtɪˈneɪʃəs)
 
adj
1.  doggedly resolute in purpose or belief; unyielding
2.  stubbornly persistent
 
[C17: from Latin pertināx, from per- (intensive) + tenāx clinging, from tenēre to hold]
 
perti'naciously
 
adv
 
pertinacity
 
n
 
perti'naciousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

pertinacity
1504, from M.Fr. pertinacité (1419), from O.Fr. pertinace "obstinate," from L. pertinacem (nom. pertinax) "very firm, tenacious," from per- "very" + tenax (see tenacious).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Insisting with dogged pertinacity upon the dogma of the prophet, that it is sinful to yield obedience to infidels.
Since outsiders have not always agreed, their history has been tumultuous, but their pertinacity has also been rewarded.
The horde of office-seekers is remarkable for number and pertinacity.
Figuratively, one who follows up an enemy with pertinacity.
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