con·sti·tu·tion·al·ism 
(kŏn′stĭ-tshə-nə-lĭz′əm, -ty-)
(kŏn′stĭ-tshə-nə-lĭz′əm, -ty-)n.
1. Government in which power is distributed and limited by a system of laws that the rulers must obey.
2.
a. A constitutional system of government.
b. Advocacy of such a system.
con′sti·tution·al·ist n.