Longman Dictionary of Contemporary English homepage

frequency

noun
     
fre‧quen‧cy W3 plural frequencies
1 [uncountable] the number of times that something happens within a particular period of time or within a particular group of people
frequency of
the frequency of serious road accidents
the high/low frequency (of something)
the higher frequency of diabetes in older people
Side effects from prescribed drugs are being reported with increasing frequency (=more and more often).
The relative frequency of fraternal twins has halved since 1950.
2 [uncountable] the fact that something happens a lot [= regularity]:
Businesses come and go with alarming frequency.
3 [uncountable and countable] technicalTCB the number of radio waves, sound waves etc that pass any point per second:
This station broadcasts on three different frequencies.
high/low frequency
Dolphins produce a high frequency sound.
the frequency range of the human ear

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