Sentence:  One part of her audience was totally engaged , the connoisseur witnessing a peculiarly fine performance of some <WSD>ancient</WSD> classic , the other part , the guest of the connoisseur , attentive as one who must take an intelligent interest in that which he does not fully understand . 
Meaning of the word marked with <WSD> tags:  belonging to times long past especially of the historical period before the fall of the Western Roman Empire