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Webster's Dictionary (1865)

Pĕr'ti-na-cy, n.

noun

n. [Lat., It., Sp., & Pg. pertinacia, from Lat. pertinax. See PERTINACIOUS.] [Obs.]

  1. Obstinacy; stubbornness; persistency; resolution; steadiness. Bp. Taylor.
  2. [Lat. pertinere, to pertain. See PERTINENCE.] The quality of being pertinent; pertinence.