PSabbr.1. police sergeant2. postscript3. public schoolpsabbr. picosecondAmerican 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.ps the internet domain name for (Computer Science) Palestinian Territories PS abbreviation for 1. (Nautical Terms) Passenger Steamer 2. (Linguistics) phrase structure 3. (Law) Police Sergeant 4. (Printing, Lithography & Bookbinding) Also: ps postscript 5. (Professions) private secretary 6. (Government, Politics & Diplomacy) private secretary 7. (Theatre) prompt side Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014PS phrase structure. P.S. 1. Also, p.s. postscript. 2. Privy Seal. 3. Public School. ps picosecond. Ps. or Psa., Psalm. ps. 1. pieces. 2. pseudonym. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.