Definition of supersonically in US English:

supersonically

adverb

  • See supersonic

    • ‘The blast waves of the supernovas move supersonically through the clouds, compressing the gas and dust, and possibly creating pockets of extremely high density - the preconditions for the formation of stars.’
    • ‘The last Concorde to fly supersonically before the aircraft was taken out of service has gone on show to the public at a ground-based tribute to the first commercial airliner ever to fly at more than twice the speed of sound.’
    • ‘The energy in the return stroke channel gives it a temperature and pressure higher than the surrounding air, so that the channel expands supersonically, generating a cylindrical shock wave which is heard as thunder.’

Pronunciation

supersonically

/ˌso͞opərˈsänək(ə)lē//ˌsupərˈsɑnək(ə)li/