The practice of having three legislative or parliamentary chambers (noun)
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Use "tricameralism" in a sentence
"Mark Tushnet: column in the Washington Post, entitled "McCain's Veto Pen," George Will comes down squarely in favor of tricameralism, i.e., giving the Great Decider in the White House equal legislative power with majorities of the 435 members of the House and 100 members of the Senate."
"But it is quite stupid to say that "voters .... prefer divided government" if by that statement one suggests that a majority of Americans in fact prefer tricameralism and gridlock over the effective capacity to govern."
"Again, I wonder if anyone elsewhere in the world, faced with the task of designing a workable constitution that would engender the loyalty of a thinking citizenry, would be "inspired" by Will's column to say, "We should certainly emulate the US and its propensity for tricameralism and the excessive power granted one man or woman, whatever their competence.""