A
codified constitution where the fundamental or basic laws establishing
the framework of government are written down, with the major duties, powers and
functions of the institutions of government and the rights and duties of
individuals codified.
An
uncodified constitution is a type of constitution where the
fundamental rules often take the form of customs, usage, precedent and a
variety of statutes and legal instruments.
The difference
between a codified and uncodified constitution is quite simple. Codified means
the constitution is written down in a single document. The US constitution is
codified. An uncodified constitution just means it's not written down in one
single document; the constitution could be found in many documents or even not
written down- this is called a convention- where it's just tradition that gives
a law it's power.