Sentence:  I wonder whether Margaret Thatcher, Harold Macmillan, Winston Churchill, Lloyd George, Benjamin Disraeli and William Gladstone (going back in time) thought of themselves as mere <WSD>firsts among equals</WSD>. 
Meaning of the word marked with <WSD> tags:  In the British and other parliamentary systems, a term used to describe the relationship of the prime minister to the other members of the cabinet.