Subsonic Definition

sŭb-sŏnĭk
adjective
Of less than audible frequency.
American Heritage
Designating, of, or moving at a speed in a surrounding fluid less than that of sound in the same fluid.
Webster's New World
Webster's New World

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

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