What is another word for agreeing on the constitution?

There isn't a single perfect synonym for "agreeing on the constitution" as the phrase itself is quite specific. However, depending on the context, you could use phrases like:

Formal:

* Ratifying the constitution: This emphasizes the formal act of accepting the constitution as law.

* Adopting the constitution: Similar to ratifying, this focuses on the official acceptance of the constitution.

* Endorsing the constitution: This highlights the support and approval of the constitution.

Informal:

* Coming to terms with the constitution: This suggests a process of understanding and accepting the constitution.

* Agreeing on the rules: This implies that the constitution sets forth the fundamental rules of the society or organization.

* Uniting under a common framework: This emphasizes the unifying effect of the constitution.

Ultimately, the best word or phrase to use depends on the specific context and the nuance you want to convey.