NSabbr.1. or N/S New Style2. Nova Scotia3. nuclear shipnsabbr. nanosecondAmerican 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.ns abbreviation for 1. new series 2. not specified NS abbreviation for 1. New Style (method of reckoning dates) 2. not sufficient or not satisfactory 3. (Placename) (esp in postal addresses) Nova Scotia 4. (Nautical Terms) nuclear ship Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014NS Nova Scotia. ns or nsec, nanosecond. N.S. Nova Scotia. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.