n (nautical) A number of vessels in company, especially war vessels; also, the collective naval force of a country, etc.
n (context|nautical|British Royal Navy) Any command of vessels exceeding a squadron in size, or a rear-admiral's command, composed of five sail-of-the-line, with any number of smaller vessels.
n (context|nautical|obsolete) A flood; a creek or inlet, a bay or estuary, a river subject to the tide.
n (nautical) A location, as on a navigable river, where barges are secured.