SUBSONIC

Pronunciation (US):

(GB):

 Dictionary entry overview: What does subsonic mean? 

• SUBSONIC (adjective)
  The adjective SUBSONIC has 1 sense:

1. (of speed) less than that of sound in a designated medium

  Familiarity information: SUBSONIC used as an adjective is very rare.

 Dictionary entry details 

• SUBSONIC (adjective)

Sense 1

Meaning:

(of speed) less than that of sound in a designated medium

Context example:

aircraft flying at subsonic speeds

Antonym:

sonic ((of speed) having or caused by speed approximately equal to that of sound in air at sea level)

supersonic ((of speed) greater than the speed of sound in a given medium (especially air))