pertinacity Hear it!

pertinacity definition

per·ti·nac·ity (pʉrt′'n as′ə tē)

noun

the quality or condition of being pertinacious; stubborn persistence; obstinacy

Etymology: MFr pertinacité

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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