A more thorough explanation:

Definition: A vice-admiral is a civil officer who has the authority to exercise admiralty jurisdiction within a specific area.

Example: In the United States Navy, a vice-admiral is a three-star flag officer who is responsible for commanding a numbered fleet or a major shore activity.

Explanation: The example illustrates how the term "vice-admiral" is used in the context of the US Navy. A vice-admiral is a high-ranking officer who has the responsibility of commanding a fleet or a major shore activity. The term "vice" in the title indicates that the officer is second in command to an admiral.