Pugnacity is the noun: the quality of being pugnacious. A person's pugnacity is how ready they are to argue or to fight. Historians write about the pugnacity of a young nation; a teacher might talk about a child's pugnacity in class.

PugnacityPugnacity is the noun是名詞 the quality of being pugnaciouspugnacious(好鬥)這種性質 A person's pugnacity一個人的pugnacity is how ready they are to argue or to fight就是他們有多容易吵架或打架 Historians write about the pugnacity of a young nation歷史學家會寫一個年輕國家的pugnacity a teacher might talk about a child's pugnacity in class老師可能在課堂上談一個小孩的pugnacity

It is formal. In ordinary speech people say he is so combative, or she always wants a fight.

It這 is formal是個正式用字 In ordinary speech people say日常口語裡人們會說 he is so combativehe is so combative(他很好鬥) or she always wants a fight或she always wants a fight(她老是想吵架)

Though actually, it names the trait, not a person and not a single fight. You have pugnacity; you are not a pugnacity.

Though actually, it names the trait不過，它指的是一種特質 not a person and not a single fight不是一個人，也不是單一一場打架 You have pugnacity你have(有)pugnacity you are not a pugnacity你不是(are)一個pugnacity

Same Latin fist-and-fight family as pugnacious and pugnaciously. It is not a boxing-term like pugilism; pugilism is the sport, pugnacity is a temper. The -acity ending is the same kind of noun-ending you hear in audacity.

Same Latin fist-and-fight family as pugnacious and pugnaciously跟pugnacious、pugnaciously同一個拉丁「拳頭與打鬥」字族 It is not a boxing-term like pugilism它不是像pugilism那樣的拳擊術語 pugilism is the sportpugilism是那項運動 pugnacity is a temperpugnacity是一種脾氣 The -acity ending-acity這個字尾 is the same kind of noun-ending you hear in audacity跟audacity(大膽)裡聽到的是同一種名詞字尾