subsonic
adjective
sub·son·ic
ˌsəb-ˈsä-nik 
1
: of, relating to, or being a speed less than that of sound in air
2
: moving, capable of moving, or utilizing air currents moving at a subsonic speed
Examples of subsonic in a Sentence
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Using the high-res ADR and production sound mixer Greg Chapman’s recordings of Elordi’s performance, Robitaille gave Cooke and re-recording mixer Brad Zoern two different subsonic booster tracks to utilize.
—
Jim Hemphill, IndieWire, 20 Feb. 2026
Their endurance has been proven in flight testing, demonstrating high subsonic speeds – 200+ nautical mile range at low altitudes and 60+ minutes duration.
—Prabhat Ranjan Mishra, Interesting Engineering, 11 Feb. 2026
When the accelerated electrons crashed into other electrons lingering in an open region downstream of the nozzle, the slower, subsonic electrons couldn’t get out of the way fast enough, and the liquid compressed.
—Quanta Magazine, 11 Feb. 2026
During ground operations, including taxiing, takeoff, climbing, and subsonic cruising, the engine acts like a highly efficient turbofan, with the blisks drawing in the air and accelerating it to shoot out the back.
—New Atlas, 14 Dec. 2025
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Jim Hemphill, IndieWire, 20 Feb. 2026
Their endurance has been proven in flight testing, demonstrating high subsonic speeds – 200+ nautical mile range at low altitudes and 60+ minutes duration.
—Prabhat Ranjan Mishra, Interesting Engineering, 11 Feb. 2026
When the accelerated electrons crashed into other electrons lingering in an open region downstream of the nozzle, the slower, subsonic electrons couldn’t get out of the way fast enough, and the liquid compressed.
—Quanta Magazine, 11 Feb. 2026
During ground operations, including taxiing, takeoff, climbing, and subsonic cruising, the engine acts like a highly efficient turbofan, with the blisks drawing in the air and accelerating it to shoot out the back.
—New Atlas, 14 Dec. 2025
See All Example Sentences for subsonic
Cite this Entry
“Subsonic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subsonic. Accessed 1 Mar. 2026.
Copy CitationKids Definition
subsonic
adjective
sub·son·ic
ˌsəb-ˈsän-ik
ˈsəb-
1
: of, relating to, or being a speed less than that of sound in air
2
: moving, capable of moving, or using air currents moving at a subsonic speed
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