# Subsonic

**adjective**

1.

noting or pertaining to a speed less than that of sound in air at the same height above sea level.

2.

infrasonic.

**adjective**

1.

being, having, or travelling at a velocity below that of sound: a subsonic aircraft

subsonic

(sŭb-sŏn’ĭk)

Having a speed less than that of sound in a designated medium, usually air; having a velocity less than Mach 1. Compare hypersonic, supersonic, transonic.

Tagged: s

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