term:

Prime Minister

prime minister n

1 : the chief minister of a ruler or state
2 : the official head of a cabinet or ministry
;esp
: the chief executive of a parliamentary government
prime min·is·te·ri·al [-mi-nə-stir-ē-əl]
adj

prime min·is·ter·ship n

prime min·is·try [-mi-nə-strē]
n