n.[C]

1. （常大写）海军[G]
   He is an officer in the Navy.

   他是一个海军军官。

2. 海军舰队

n.

1. [treated as sing. or pl.] the branch of a state's armed services which conducts military operations at sea.
   ▸literary a fleet of ships.
2. (also navy blue) a dark blue colour.