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Definitions from Wiktionary ()
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▸ adjective: (of a sound, literary) very quiet, almost inaudible
▸ adjective: (of a speed) (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
▸ adjective: (fluid mechanics, of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)
▸ noun: an aircraft whose maximum speed is less than the speed of sound
Similar:
infrasonic,
unacoustic,
nonsonorous,
nonaudible,
unsonorous,
subdetection,
nonultrasonic,
subeffective,
asonant,
inaudible,
more...
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