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What does subsonic mean?

Looking for the meaning or definition of the word subsonic? Here's what it means.

Adjective
  1. (of a sound, scientific) Having a frequency too low to be audible.
  2. (of a sound, literary) Very quiet, almost inaudible.
  3. (of a speed) Less than the speed of sound (in the same medium, and at the same temperature and pressure).
  4. (fluid mechanics, of a flow) With 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.
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