Definition of high frequency in US English:
 high frequency
nounˌhaɪ ˈfrikwənsiˌhī ˈfrēkwənsē
(in radio) a frequency of 3–30 megahertz.
as modifier high-frequency words
 high-frequency hearing loss
 Example sentencesExamples
-  A recent study found evidence of high-frequency hearing loss in nearly one third of a cohort of college students.
 -  The tests involve measuring magnetic properties of molecules in the blood samples using high-frequency radio waves.
 -  Customers can bring their battery-operated laptops and access the internet via high-frequency radio signals.
 -  There appeared to be no more need for high-frequency radio because of all the modern communications technologies.
 -  We've added a high-frequency radio to improve communications.
 
 Synonyms
high-pitched, high-frequency, soprano, treble, falsetto, shrill, acute, sharp, piping, piercing, penetrating