constitutionalism
    n 1: a constitutional system of government (usually with a
         written constitution)
    2: advocacy of a system of government according to
       constitutional principles

Constitutionalism \Con`sti*tu"tion*al*ism\
   (k[o^]n`st[i^]*t[=u]"sh[u^]n*al*[i^]z'm), n.
   The theory, principles, or authority of constitutional
   government; attachment or adherence to a constitution or
   constitutional government. --Carlyle.
   [1913 Webster]