Home › Words › P › pertinacypertinacypertinacy means the quality or state of being pertinent; pertinence.Among words judged in Lexicurio's Arena, pertinacy ranks #3,434 of 42,806 for Qualifying.EtymologyFrom Latin pertinere.nounThe quality or state of being pertinent; pertinence.Definitions & examples from Wiktionary (CC BY-SA 3.0).