SUBSONIC

subsonic

(adjective) (of speed) less than that of sound in a designated medium; “aircraft flying at subsonic speeds”

Source: WordNet® 3.1

Etymology

Adjective

subsonic (not comparable)

(of a sound, scientific) having a frequency too low to be audible

(of a sound, literary) very quiet, almost inaudible

(of a speed) (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)

(fluid mechanics, of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)

Noun

subsonic (plural subsonics)

an aircraft whose maximum speed is less than the speed of sound

Source: Wiktionary

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