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prep.adv. & adj. Informal
American 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.
(adverb, adjective) chiefly US a variant spelling of through
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
prep., adv., adj.
usage: The spelling thru, advocated for over a century by various spelling-reform groups, is now used chiefly informally or in headlines or signs. However, some periodicals use thru as a standard variant, regardless of context.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
short for through.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.