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persuader
persuasion
persuasive
PERT
pert
pertain
Perth
Perth and Kinross
pertinacious
pertinent
perturb
perturbation
perturbation theory
pertussis
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pertinacious
per·ti·na·cious [ pùrti náyshəss ]


adjective 
Definition:
 
resolute: determinedly resolute in purpose, belief, or action
[Early 17th century. < Latin pertinac- "very tenacious" < tenac- (see tenacious)]

per·ti·na·cious·ly adverb
per·ti·na·cious·ness noun
per·ti·nac·i·ty [ pùrti nássətee ] noun
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