high-frequency \ˈ ̷ ̷| ̷ ̷ ̷ ̷ ̷ ̷\adjective Etymology:high frequency 1.: occurring very frequently < drills based on the repetition of high-frequency words > 2.: relating to high frequency: as a.: involving a radio wave of high frequency — used especially of sound waves and vibrations b.: supersonic 1