admiral of the fleet

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Admiral of the fleet is the highest grade of flag officer authorized in the United States Navy. An admiral of the fleet is superior to a four star admiral and is junior only to the Secretary of the Navy, Secretary of Defense, and the President of the United States. An admiral of the fleet is equal in grade or rank to a general of the army.
• noun a naval officer of equivalent grade or rank in the naval forces of other nations.