adjective Chiefly Aeronautics.
close to the speed of propagation of sound; moving at 700–780 miles per hour (1127–1255 km/h) at sea level.
- transom window,
- transonic barrier,
Origin of transonic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
of or relating to conditions when travelling at or near the speed of sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Relating to or capable of speeds at or near the speed of sound (at or approaching Mach 1) or to aerodynamic conditions for bodies travelling at such speeds. Compare hypersonic subsonic supersonic.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.