Sentence:  In March , 1961 , representatives of the national laboratories of Australia , Canada , The Netherlands , <WSD>United</WSD> Kingdom , U. S. S. R. , United States , and West Germany , met at the NBS to devise means for reaching international agreement on a temperature scale between 10 and 90 * * f . 
Meaning of the word marked with <WSD> tags:  a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom