A flag officer in the United States Navy or Coast Guard of a grade superior to vice admiral and junior to admiral of the fleet (when that grade is used). An admiral is equal in grade or rank to a four star general
An admiral is a very senior officer who commands a navy. Admiral Hodges. a high rank in the British or US navy, or someone with this rank (amiral, from admirallus, from amir-al- (as in amir-al-bahr ))
any of several brightly colored butterflies the supreme commander of a fleet; ranks above a vice admiral and below a fleet admiral