Sentence:  “I was once invited to give a speech about the attempt to topple Iran's political system through a ‘<WSD>velvet</WSD> revolution,' ” says Etaat in the debate, “but we all know that ‘<WSD>velvet</WSD> revolutions' always occur in dictatorships.” 
Meaning of the word marked with <WSD> tags:  peaceful, carried out without violence; especially as pertaining to the peaceful breakup of Czechoslovakia.