constitutionally

US /ˌkɑːn.stəˈtuː.ʃən.əl.i/
UK /ˌkɑːn.stəˈtuː.ʃən.əl.i/
1.

constitutionnellement

according to the rules in a constitution:

:
•
There was some doubt as to whether the government was behaving constitutionally.
:
constitutionalism