The Collaborative International Dictionary
Fleet \Fleet\, n. [OE. flete, fleote, AS. fle['o]t ship, fr. fle['o]tan to float, swim. See Fleet, v. i. and cf. Float.] A number of vessels in company, especially war vessels; also, the collective naval force of a country, etc.
Fleet captain, the senior aid of the admiral of a fleet,
when a captain.
--Ham. Nav. Encyc.
Wiktionary
n. 1 (context military nautical English) a captain in command of a fleet, convoy or flotilla 2 (context military nautical English) a non-flag naval rank above that of captain and below that of the admiralty ranks, having an O7 NATO rank scale equivalency
Wikipedia
Fleet captain is a historic military title that was bestowed upon a naval officer who served as chief of staff to a flag officer.
Usage examples of "fleet captain".
She wouldn't risk an interplanetary incident just to kill a fleet captain.
When Cally boarded with Sinda's purse and laptop, the pilot at the door, a Fleet captain in black, gave her a rather cold look.
He knew she came with a red-hot combat record and everything, but no Fleet captain could easily accept taking orders from a dirtside colonel, especially one who carried on as if she were ordained to command.
You should be a Fleet Captain and more, not some assassin errand boy.
For once, it made sense for a Fleet Captain to do the detail work: Sammy was the only one in the fleet who had actually met The Man in person.
A single Fleet captain against the most powerful families in the Federation, against the massed pirates, plus the Seti?