(DoD, NATO) The speed at which sound travels in a given medium under specified conditions. The speed of sound at sea level in the International Standard Atmosphere is 1108 ft/second, 658 knots, 1215 km/hour. See also hypersonic; transonic.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
| APA | Military Dictionary (DoD). (2011). speed of sound. Retrieved September 21, 2026, from http://smartdefine.org/speed_of_sound/definitions/1964080 |
| Chicago | Military Dictionary (DoD). 2011. "speed of sound" http://smartdefine.org/speed_of_sound/definitions/1964080 (accessed September 21, 2026). |
| Harvard | Military Dictionary (DoD) 2011, speed of sound, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/speed_of_sound/definitions/1964080>. |
| MLA | Military Dictionary (DoD). "speed of sound" 4 April 2011. Web. 21 September 2026. <http://smartdefine.org/speed_of_sound/definitions/1964080> |