It's the 2-word title for the head of a parliamentary government
This is in contrast to a 
presidential system in a democracy, where the head of... [DOC] [TLE] Terminology - a list of parliamentary words - The Government of the ... [PAR] cabinet - the group of ministers appointed by the President ... division - the 
separation of the members of a house of Parliament into two groups, ... at the end 
of which a government or company balances its accounts and reports on them ... 
the first time of the long title of a bill, usually straight after it is presented to the 
house.