
Speed of flight at or greater than Mach 5.0, exceeding SUPERSONIC.
Found on
http://www.aerofiles.com/glossary.html

Descriptive of something that travels at speeds greater than Mach 5 (five times the ambient speed of sound). At such speeds, the temperature in the boundary layer and on the surface of the moving vehicle exceeds 1,800 °F (1,000 °C) and aerodynamic heating becomes important in aircraft design...
Found on
http://www.daviddarling.info/encyclopedia/H/hypersonic.html

Pertaining to or characterised by supersonic speeds of Mach 5 or greater. While any speed above the speed of sound may be referred to as supersonic, speeds of Mach 5 or greater are specifically referred to as hypersonic. ... Origin: hyper-+ L. Sonus, sound ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: hī′pĕr-son′ik Definitions: 1. Pertaining to or characterized by supersonic speeds of Mach 5 or greater. Although any speed above the speed of sound may be referred to as supersonic, speeds of Mach 5 or greater are specifically referred to as hypersonic.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=42606

The sound waves which have frequencies above 500 megahertz.
Found on
http://www.vidyagyaan.com/general-knowledge/science/glossary-of-physics-ter

hypersonic (high' pur SAHN ik) 1. Much faster than the speed of sound. 2. Relating to speeds five or more times than that of the normal speed of sound in the air; such as, rockets, certain air currents, aircraft, etc.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1986/

A range of speed that is five times or more the speed of sound in air. See also: Hypervelocity, Subsonic, Supersonic.
Found on
https://www.encyclo.co.uk/local/20687

Speed of flight at or greater than Mach 5.0, exceeding SUPERSONIC.
Found on
https://www.encyclo.co.uk/local/22323

noting or pertaining to speed that is at least five times that of sound in the same medium.
Found on
https://www.infoplease.com/dictionary/hypersonic
No exact match found.