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Of, relating to, or capable of speed equal to or exceeding five times the speed of sound.
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.
(General Physics) concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
hy•per•son•ic(ˌhaɪ pərˈsɒn ɪk)
noting or pertaining to speed that is at least five times that of sound in the same medium.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Of or pertaining to speeds equal to, or in excess of, five times the speed of sound. See also speed of sound.
Dictionary of Military and Associated Terms. US Department of Defense 2005.