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subsonic

adjectivenoun
Quick answer

As an adjective, subsonic means having a frequency too low to be audible. As a noun, it means an aircraft whose maximum speed is less than the speed of sound.

Meanings of subsonic

5 meanings

adjective

  1. of a soundscientificHaving a frequency too low to be audible

  2. of a soundliteraryVery quiet, almost inaudible

    “The noise of the ship was all around her. The faint subsonic rumble of the reactor and drive. (Leviathan Wakes, James S. A. Corey)”

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

  4. fluid mechanicsof a flowWith a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)

noun

  1. An aircraft whose maximum speed is less than the speed of sound

Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).

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