arch·way (ärch?w??)n.1. A passageway under an arch.2. An arch over an entrance or passageway.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.archway (???t??we?) n (Architecture) a passageway or entrance under an arch or archesCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014arch?way (??rt??we?) n. 1. an entrance or passage under an arch. 2. an arch over a passage. [1795?1805] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.