Sentence:  in his motherland ; in the spacious hunting grounds of `` Uncle Sam '' ; in the exciting salons of his lovely , brilliant Paris - <WSD>mistress</WSD> of gaiety - excess and abandon - world theatre of new found freedoms in tone , color , dance , design , and thought . 
Meaning of the word marked with <WSD> tags:  an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man