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sea letter

British  

noun

  1. Also called: passport.  a document issued to a merchant vessel, esp in wartime, authorizing it to leave a port or proceed freely

  2. (formerly) a document issued to a vessel in port, describing its cargo, crew, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Gray was also provided with a sea letter signed by George Washington, then President, which ran as follows:

From Explorers and Travellers by Greely, Adolphus W.

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