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Subsonic

adj, noun

Definitions

Adjective
  1. 1
    having a frequency too low to be audible not-comparable
  2. 2
    very quiet, almost inaudible literary, not-comparable

    "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. 3
    (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure) not-comparable

    "But British Airways Flight 112 made the trek in under five hours, setting a new record for the fastest subsonic commercial flight across the Atlantic Ocean."

  4. 4
    with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources) not-comparable
Adjective
  1. 1
    (of speed) less than that of sound in a designated medium wordnet
Noun
  1. 1
    an aircraft whose maximum speed is less than the speed of sound

Etymology

Etymology 1

From sub- + sonic.

Etymology 2

From sub- + sonic.

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