n (US|military|nautical) A commissioned officer in the United States Navy, United States Coast Guard|Coast Guard, National Oceanic and Atmospheric Administration Commissioned Corps|NOAA Corps, or Public Health Service Commissioned Corps|PHS Corps of a grade superior to a captain and junior to a rear admiral (upper half). A rear admiral (lower half) is equal in grade or rank to an United States Army|Army, United States Marine Corps|Marine Corps, or United States Air Force|Air Force brigadier general.
n (US|military|nautical) A naval officer of equivalent grade or rank in the navy of other countries, such as commodore.