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Hate speech
expression targeting individuals or groups on the basis of race, religion, gender, or sexuality, which may incite hostility or violence. Whether hate speech constitutes "harm" in Mill's sense is one of the most contested questions in contemporary free speech debates.
The harm principle
The harm principle is John Stuart Mill's central claim in On Liberty (1859) that the only legitimate reason for exercising power over an individual against their will is to prevent harm to others.
The marketplace of ideas
The marketplace of ideas is a metaphor derived from Mill's arguments in Chapter II of On Liberty for the process by which truth emerges through open competition among opinions, since suppressing any opinion deprives humanity of the chance to exchange error for truth.