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.
Also, transsonic.

1940–45; trans- + sonic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
transonic (trænˈsɒnɪk)
of or relating to conditions when travelling at or near the speed of sound

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
transonic  [%PREMIUM_LINK%]     (trān-sŏn'ĭk)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The aerodynamic changes through this transonic region are dramatic, especially for the aircraft flying supersonic.
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