Noun
member state (plural member states)
A sovereign state which is a member of an international organisation or some kind of confederation of other such states.
As of 1st January 2007 the European Union will have 27 member states.
Synonym: member country
It is true that no member state can be required to make payments to others. But if countries want to offer voluntary assistance, as in the Greek case, this isn't only allowed, but it's also in Germany's interest. We all benefit by ensuring the stability of the euro zone. Wolfgang Schauble
This was supported by a public statement issued by the party which insinuated that Gonsalves had in fact proposed to direct a constitutional body in another CARICOM Member State, in the “execution of its duties.” Source: Internet