WIabbr.1. or W.I. West Indies2. WisconsinAmerican 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.WI abbreviation for 1. (Placename) West Indian 2. (Peoples) West Indian 3. (Placename) West Indies 4. (Placename) Wisconsin 5. (Social Welfare) (in Britain) Women’s Institute Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014WI Wisconsin. W.I. 1. West Indian. 2. West Indies. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.