* Simple and direct: "Constitutionalism is the principle that government power should be limited and accountable."
* Historical context: "The American Revolution was fueled by a belief in constitutionalism and the rights of the individual."
* Comparative analysis: "The British system of constitutionalism differs from the American model in its emphasis on parliamentary sovereignty."
* Focusing on a specific aspect: "Constitutionalism requires a system of checks and balances to prevent tyranny."
* In a contemporary context: "The rise of populism has challenged the principles of constitutionalism in many countries."
The best way to use "constitutionalism" depends on the specific context and what you want to emphasize.