In a way that is in agreement with or allowed by a constitution; according to constitutional principles or law.
From 'constitutional' with the adverbial suffix '-ly.' This is the standard adverb form used to describe how something is done in accordance with constitutional requirements.
A president might act 'constitutionally' or 'unconstitutionally,' and courts spend years fighting over which it was—the word marks the crucial line between legal power and government overreach!
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