The document defines 16 vocabulary words: pertinacious, tenet, satiety, tenuous, felicitous, extenuating, plenary, attenuate, intrusive, tenable, rectitude, contend, allude, ostensible, incorrigible, portend. The words are related to concepts like stubbornness, principles, fullness, weakness, suitability, excuses, completeness, reduction, forcing in, defendability, character, arguing, mentioning indirectly, seeming, inability to change, and being a sign of.