Sentence:  The Rabbit could not claim to be a model of anything, for he didn't know that real rabbits existed; he thought they were all stuffed with sawdust like himself, and he understood that sawdust was quite out-of-date and should never be mentioned in modern <WSD>circles</WSD>. 
Meaning of the word marked with <WSD> tags:  A specific group of persons; especially one who shares a common interest.