Dissent means exactly what I said it meant, look up the term in the dictionary and it will say something like
this. Dissent is an official function at any meeting or parliamentary sitting whereby those who make up a quorum can move against the decision made by a chairman or speaker respectively. Such acts are normally done peacefully and can make up part of the debate conducted at the time. As such, you can move dissent without breaking any laws and without seeking to insult people or accuse them of any wrong-doing. The issues relating to the British Poll Tax is entirely different. People showed dissent, sure, but that has nothing to do with the actual acts of tax evasion (a crime) or inciting riots (another crime).
