subsonically


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subsonically

(ˌsʌbˈsɒnɪkəlɪ)
adv
(General Physics) at a velocity below that of sound
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References in periodicals archive ?
Since the 208 travels subsonically, I steered clear of the heavier bullet for trajectory purposes just in case we found ourselves needing to shoot to 200 or 300 yards.
The X-15 design proposal request called for an aircraft which could fly in the hypersonic flight regime to gather data for future aircraft designs but also fly transonically as well as subsonically.
3 Orbital Sciences GQM-163 Coyote (which received the first US Navy production order in late 2007) can represent Threats A, B and C, it evidently cannot cruise subsonically for 170 km and reach Mach 2.