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1. In certain royal families, especially that of imperial Austria, a nobleman having a rank equivalent to that of a sovereign prince.
2. Used as a title for such a nobleman.
[Obsolete French archeduc : arche-, arch- (from Old French; see arch-1) + duc, duke (from Old French; see duke).]
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.
the territory ruled by an archduke or archduchessthe position or rank of an archduke
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014