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Definition of pertinacity - 3 dictionary results

per⋅ti⋅nac⋅i⋅ty

  [pur-tn-as-i-tee]
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–noun
the quality of being pertinacious; persistence.
Origin:
1495–1505; < LL pertinācitās, for L pertinācia stubbornness, perseverance (> obs. pertinacy), equiv. to pertināci- (s. of pertināx) steadfast, stubborn + -tās -ty 2 . See per-, tenacity

Synonyms:
firmness, determination, resolution. See perseverance.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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per·ti·nac·i·ty   (pûr'tn-ās'ĭ-tē)   
n.  The quality or state of being pertinacious: "Again and again ... with the inexorable pertinacity of a child ... did he renew his efforts" (Nathaniel Hawthorne).
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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