Definition of pertinacity noun from the Oxford Advanced Learner's Dictionary

 

pertinacity

 noun
noun
BrE BrE//ˌpɜːtɪˈnæsəti//
 
; NAmE NAmE//ˌpɜːrtnˈæsəti//
 
[uncountable](formal)
 
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the quality of being determined to achieve a particular aim despite difficulties or opposition With his usual pertinacity, he pursued this new line of enquiry.