The document defines key concepts related to constitutions including: 1) A constitution establishes the fundamental powers and principles that govern a nation and defines how these powers are distributed among branches of government. 2) Constitutional law deals with the nature, formation, amendment, and interpretation of constitutions. 3) Constitutions can be written or unwritten, rigid or flexible depending on their origin and process for amendment. 4) An ideal written constitution is brief, broad, and definite while establishing the structure of government, individual liberties, and national sovereignty.