power (control, particularly legal or political) / power (influence) / government, authority

(chiefly in vocative case) A term of address used for policemen; officer, sir

(government, law) legislative branch, legislature (branch of government which is concerned with the making of laws)

(government, law) executive branch, executive (branch of government which is concerned with the carrying out of the laws)

(government, law) judicial branch, judiciary (branch of government which is concerned with the administration of justice through the interpretation of the law)

(idiomatic, literary, media) fourth estate (journalism or journalists considered as a group)