Sentence:  Such was the impromptu that Voltaire gave to howls of laughter at Sans Souci and that was soon circulated in manuscript throughout the literary <WSD>circles</WSD> of Europe , to be printed sometime later , but with the name of Timon of Athens , the famous misanthrope , substituted for that of Rousseau . 
Meaning of the word marked with <WSD> tags:  an unofficial association of people or groups