ka·ta·na (k?-tä?n?)n. A long, single-edge sword for use with two hands, traditionally worn by samurai.[Japanese, from Old Japanese : kata, opposite side, one (of a pair) + na, blade.]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.katana (k??t??n?) n (Fencing) a long, curved single-edged sword traditionally used by Japanese samurai[C18: Japanese]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014