Learn how to say Frequency correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word frequency:
noun (plural frequencies)
1 [mass noun] the rate at which something occurs over a particular period of time or in a given sample:
an increase in the frequency of accidents due to increased overtime
the fact or state of being frequent or happening often.
2the rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light):
different thicknesses of glass will absorb different frequencies of sound
(Symbol: f or ν)
the particular waveband at which radio signals are broadcast or transmitted:
a radio station on a single AM radio frequency
a coding sequence to ensure that everyone changes frequency in the correct manner
mid 16th century (gradually superseding late Middle English frequence; originally denoting a gathering of people): from Latin frequentia, from frequens, frequent- ‘crowded, frequent’
Remember that frequency and the related word frequent are spelled with -quen- in the middle.