USSabbr.1. United States Senate2. United States shipAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.USS abbreviation for 1. (Government, Politics & Diplomacy) United States Senate 2. (Nautical Terms) United States Ship Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014USS or U.S.S., 1. United States Senate. 2. United States Service. 3. United States Ship. 4. United States Steamer. 5. United States Steamship. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.