This is the 4562nd most frequent Portuguese word.
constitucionais
"Constitucionais" means "constitutional" in English.
In this sentence, 'constitucionais' is used as an adjective describing 'direitos' (rights), indicating that the rights are enshrined and protected by the constitution.
Os direitos constitucionais dos cidadãos devem ser protegidos.
The constitutional rights of the citizens must be protected.
Here, 'constitucionais' modifies 'mudanças' (changes), denoting modifications or amendments relevant to or prescribed in the constitution.
Mudanças constitucionais requerem aprovação pelo Congresso.
Constitutional changes require approval by the Congress.
In this example, 'constitucionais' describes 'princípios' (principles), establishing these as foundational guidelines derived from the constitution.