Meaning of admiral

ad•mi•ral

1. the commander in chief of a fleet.
2. a naval officer of the highest rank.
3. a naval officer of a high rank: the grades in the U.S. Navy are fleet admiral, admiral, vice-admiral, and rear admiral.
4. the flagship of an admiral.
5. a master who directs a fishing fleet.
6. any of several often brightly colored butterflies of the family Nymphalidae, as Vanessa atalanta