Usage Note
Constitutionnel relates to a country's constitution or to what is permitted under it: un droit constitutionnel ('a constitutional right'), une monarchie constitutionnelle ('a constitutional monarchy'). The feminine is constitutionnelle. The related noun is constitutionnalité (constitutionality), used in legal contexts to challenge whether a law conforms to the constitution.
Examples
"Ce droit est constitutionnel en France."
Natural Translation
This right is constitutional in France.

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