Constitutionalism

Paper II, Sec B 2.1
Vocabulary.com defines Constitutionalism as

to describe the belief that a government's authority is dictated by a specific law or group of laws — a constitution. 

Merriam Webster  defines it as

adherence to or government according to constitutional principlesalso : a constitutional system of government

Concept:

• principle that the government is limited by fundamental law; limitation of the government by the constitution under higher law
• check and balance of the system, 
• make the government responsible

Elements of Constitutionalism as listed in Maru Bazezew (2009):

•  Popular sovereignty
•  Separation of Powers
•  Responsible and accountable government 
•  Rule of law
•  An independent judiciary
•  Respect for individual rights
•  Respect to self-determination 
•  Civilian control of the military 
•  Police governed by law and judicial control

Further Reading:

• Legal services India.com
• Constitutions and constitutionalism (Law); e-PGPathsala @Youtube
• What is constitutionalism? - Martin van Staden PODCAST @Youtube
• Bellamy, Richard. (2010). Constitutionalism. INTERNATIONAL ENCYCLOPEDIA OF POLITICAL SCIENCE, B. Badie, D. Berg-Schlosser and L. Morlino, eds., IPSA/Sage, Forthcoming. (link)