pertinacy

from The Collaborative International Dictionary of English v.0.48

Pertinacy \Per"ti*na*cy\, n. [L. pertinere to pertain. See
   {Pertinence}.]
   The quality or state of being pertinent; pertinence. [Obs.]
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Pertinacy \Per"ti*na*cy\, n. [L. pertinacia, fr. pertinax. See
   {Pertinacious}.]
   Pertinacity. [Obs.] --Chaucer.
   [1913 Webster]

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