The phrase "a number of constitutions" is correct and usable in written English.
It can be used when referring to multiple constitutions, typically in a legal or political context.
Example: "The country has undergone significant changes, leading to the adoption of a number of constitutions over the years."
Alternatives: "several constitutions" or "multiple constitutions".
After the nation won its independence, a number of state constitutions proudly included the right of impeachment.
A number of the constitutions drafted in Europe and Asia after World War II incorporated judicial review in various forms.
C. A number of the constitutions of appellant unions provide for the use of compulsory dues and assessments to finance union insurance and death benefit plans.
Economic and social rights are found in a number of national constitutions around the world, as well as in legally binding multi-lateral treaties, the most prominent being the International Covenant on Economic, Social and Cultural Rights.
A number of states amended their constitutions to this effect almost immediately after the legalisation of pregnancy termination on request in the Federal District in April of 2007.
In 2004 the sultan approved a number of amendments to the constitution.
Critics claim that CCM is opposed to the new structure because it would make it more difficult for it to retain power.The dust-up over Zanzibar has overshadowed a number of improvements to the constitution, in the areas of human rights and gender equality.
On December 2nd Venezuelans voted on a number of amendments to their constitution.
The letter -- which actually features a number of errors regarding the Constitution -- has been widely seen as an attempt to sabotage the ongoing talks by eroding Iranian leaders' trust in the United States.
As evidence of his effectiveness in his new role as broker, Mr. Chalabi claims credit for helping to persuade Shiite leaders to accept a number of compromises on the interim constitution.
