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1. An officer in command of ten men in the army of ancient Rome.
2. A member of a municipal senate in ancient Rome that ran local government.
[Latin decuriō, from decuria, group of ten men, administrative body of ten families, from *decu-viria : decem, ten; see dekm̥ in Indo-European roots + vir, man; see wī-ro- in Indo-European roots.]
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.
(in the Roman Empire) n
1. (Historical Terms) a local councillor
2. (Military) the commander of a troop of ten cavalrymen
[C14: from Latin decuriō, from decuria company of ten, from decem ten]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
de•cu•ri•on(dɪˈkyʊər i ən)
1. a commander of ten men in the ancient Roman cavalry.
2. a member of an ancient Roman senate.
[1350–1400; Middle English < Latin decuriō=decuri(a) a division of ten]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.