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An ancient Roman province that included present-day eastern Switzerland and western Austria. It was added to the Roman Empire during the reign of Augustus.
Rhae′tian adj. & n.
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.
1. (Placename) an Alpine province of ancient Rome including parts of present-day Tyrol and E Switzerland
2. (Historical Terms) an Alpine province of ancient Rome including parts of present-day Tyrol and E Switzerland
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Rhae•ti•a(ˈri ʃi ə, -ʃə)
an ancient Roman province in central Europe, including what is now E Switzerland and a part of the Tyrol.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.