Definition: The word "admiral" is a naval term that refers to an officer or a commander in charge of a fleet, usually acting as the principal authority on the deck of a warship for the safety of the crew, ships and the vessel. The concept of admiral is one of great importance in naval warfare, as it represents a significant part of the operational structure. Admiralship is also an important position in military history, as early naval command was typically held by officers who had been appointed by their superior officers. The definition of "admiral" can vary depending on cultural and historical contexts, but generally means someone responsible for commanding or overseeing a large fleet, especially one that includes ships of war. Admirals are usually promoted to the rank of admiral after reaching the rank of captain, and they possess considerable power in command.