Sentence:  It flags such possible breakdowns of communication as rehearsed dialogue , the note of disapproval , ambivalence or ambiguity , annoyance , resentment , and the disinclination to speak at all - this last often <WSD>marked</WSD> by a fade-in beginning of sentences . 
Meaning of the word marked with <WSD> tags:  be a distinctive feature, attribute, or trait; sometimes in a very positive sense