I. na ‧ vy /ˈneɪvi/ BrE AmE noun ( plural navies )
[ Date: 1300-1400 ; Language: Old French ; Origin: navie 'group of ships' , from Latin navigia 'ships' , from navigare ; ⇨ ↑ navigate ]
1 . [countable] the part of a country’s military forces that fights at sea:
the British Navy
in the navy
Is your brother still in the navy?
He joined the navy during the war.
2 . [uncountable] a very dark blue colour:
The jacket is available in navy, green, or brown.
—navy adjective
II. ˌnavy ˈblue BrE AmE ( also navy ) adjective
very dark blue:
a navy blue sweater
—navy blue noun [uncountable]