word | | Constitution |
| twice | Czech Republic | ratified 16 December 1992, effective 1 January 1993; amended 1997, 2000, 2001 (twice), 2002 |
| UK | New Zealand | consists of a series of legal documents, including certain acts of the UK and New Zealand Parliaments, as well as The Constitution Act 1986, which is the principal formal charter; adopted 1 ... |
| unicameral | Denmark | 5 June 1953; note - constitution allowed for a unicameral legislature and a female chief of state |
| Union | European Union | ... Atomic Energy Community (Euratom) in 1957; the Single European Act in 1986; the Treaty on European Union (Maastricht) in 1992; the Treaty of Amsterdam in 1997; and the Treaty of Nice in ... |
| united | Germany | 23 May 1949, known as Basic Law; became constitution of the united Germany 3 October 1990 |
| unrecognized | Cyprus | ... when the Turkish Cypriots declared independence in 1983; a new constitution for the "TRNC" passed by referendum on 5 May 1985, although the "TRNC" remains unrecognized by any country other than Turkey |
| unwritten | Canada | made up of unwritten and written acts, customs, judicial decisions, and traditions; the written part of the constitution consists of the Constitution Act of 29 March 1867, which created a federation of ... |
| unwritten | Guernsey | unwritten; partly statutes, partly common law and practice |
| unwritten | Isle of Man | unwritten; note - The Isle of Man Constitution Act of 1961 does not embody the unwritten Manx Constitution |
| unwritten | Jersey | unwritten; partly statutes, partly common law and practice |
| unwritten | United Kingdom | unwritten; partly statutes, partly common law and practice |
| US | Puerto Rico | ratified 3 March 1952; approved by US Congress 3 July 1952; effective 25 July 1952 |
| version | Kyrgyzstan | ... president, but both November and December 2006 versions were annulled in September 2007, and a new version was approved by referendum on 21 October 2007; the BAKIEV-initiated referendum was criticized by ... |