Definition of subsonically in US English:

subsonically

adverb

  • See subsonic

    • ‘It loiters subsonically at very high altitudes over the region of interest for extended periods of time without refueling.’
    • ‘The slow, gentle flicker of candles at dinner and the explosions inside the pulse jet share one characteristic: They burn subsonically, in a process scientists call deflagration.’
    • ‘There was a storm in the circle; the lightning strokes of claws slashed out and the thunder of snarls reverberated almost subsonically amongst the quiescent ruins.’
    • ‘Similarly, the jet moving overhead subsonically pushes air out of the way and, in so doing, generates pressure waves that move at the speed of sound.’
    • ‘The aircraft departed from Paris at around 11: 30 and flew out over the Atlantic Ocean for a final supersonic sprint, before heading overland subsonically to the former Aerospatiale factory at Toulouse, where a ceremony was planned to greet the aircraft.’

Pronunciation

subsonically

/-ik(ə)lē/