Definition of frequency in English:

frequency

noun

  • 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 next goal is to increase frequency, particularly at peak periods.’
    • ‘In fact in the first four weeks of December road traffic offences generally increased in frequency.’
    • ‘These days they meet with increasing frequency.’
    • ‘An allele that provides better immunity against parasites will increase in frequency within a population.’
    • ‘Alcohol may trigger attacks during the period headaches occur, so avoidance of all alcohol during these periods will reduce headache frequency.’
    • ‘Be even more wary if you are given a treatment plan that recommends daily visits that are gradually reduced in frequency over a period of several months.’
    • ‘Those attacks may increase, both in frequency and intensity.’
    • ‘Service south of Franklin will run at reduced frequency during that six-hour period.’
    • ‘Rest periods and frequency should be the same as those for increasing muscular strength.’
    • ‘Headaches are common during childhood and become more common and increase in frequency during adolescence.’
    • ‘The frequency of landslides has increased in recent years with major slides occurring in 1993, 1995 and 2002.’
    • ‘They recorded whether patients ever committed physical attacks during the observation period, but frequency and severity of violence were not recorded.’
    • ‘Over time, symptomatic periods may increase in frequency and severity.’
    • ‘The forecast is optimistic because of the expansion of the company's operations, increasing the flight frequency and the launch of new routes.’
    • ‘Poch and Mannering found that the presence of a sight-distance restriction was found to significantly increase accident frequency.’
    • ‘The floods which have devastated York with increasing frequency in recent years have traditionally been blamed on the rain - too much falling, too often.’
    • ‘Many scientists believe that the recent increase in hurricane frequency and intensity is due to global warming, which has raised sea temperatures.’
    • ‘Therefore, these mutations would not increase in frequency in the population.’
    • ‘As they moved, droplets of rain began to strike with ever increasing frequency.’
    • ‘Now, scoring regularly for Wimbledon and playing with increasing frequency for Ireland, he may fulfil the potential he showed as a teenager.’
    1. 1.1The fact or state of being frequent or happening often.
      • ‘Now they're trying to work out something where it won't happen with any kind of frequency.’
      • ‘As most people are aware, this happens with almost reliable frequency in Namibia.’
      • ‘But this has happened with enough frequency to blow away my disbelief.’
      • ‘Only 52 per cent actually test their contingency plans with any frequency.’
      • ‘That happens with great frequency in the system.’
      • ‘It happened with such frequency that the assistant referee seemed to get confused and gave some close decisions against Bafana.’
      • ‘These things seem to happen with alarming frequency these days.’
      • ‘The fact that it happened with apparent frequency seems like an important detail on many levels.’
      • ‘Yet it happens with terrible frequency, even thought it is a total ‘no no’.’
      • ‘Kids getting born covered in hair happens with some frequency, but they tend to shed it off pretty soon.’
      • ‘Laws changed with bewildering frequency, creating temporary advantages for people quick enough to spot them and draining wealth from the slow or unlucky.’
      • ‘Secondly, and this happens with remarkable frequency, notwithstanding all the technology at his disposal, the video referee can get it wrong!’
      • ‘Financial crises occur with frightening frequency.’
      • ‘It is interesting to ask, ‘why are these attacks happening with such frequency now?’’
      • ‘I was sitting around dwelling on how sad it is when it occurred to me that these small plane crashes happen with numbing frequency.’
      • ‘They wouldn't be miracles if they happened with reliable frequency.’
      • ‘I took a few courses on statistics and understand how these things can happen, though they seemed to happen with such frequency that it seemed uncanny.’
      • ‘There are incidents where water supply may be affected for half an hour to an hour, but that is negligible as such incidents are of less frequency.’
      • ‘Although such things do happen with too great frequency, cases of ‘benign neglect’ are far more common.’
      • ‘I wish I could say that this was an isolated occurrence, but it seems to happen with distressing frequency.’
  • 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’
    • ‘Crucially, this also changes the frequency of the radio waves needed to flip the nucleus.’
    • ‘We hear different sounds because of variations in the sound wave frequency.’
    • ‘That is, an infrared spectrum is a plot of the intensity of light absorbed as a function of the frequency of vibration.’
    • ‘Because laser light is made up of identical waves of the same frequency, it can travel long distances without scattering.’
    • ‘A trifield meter measures the electromagnetic frequency in the space around it.’
    • ‘Now, physicists in England have demonstrated a topsy-turvy Doppler shift in which a radio wave's frequency rises as the source recedes.’
    • ‘Whether this interference delays or advances the phase of the waves depends on the properties of the atom and the frequency of the wave.’
    • ‘Newton concluded that these forms of light vibrate at different frequencies.’
    • ‘This can be induced by a microwave field with a frequency that corresponds to the transition between the two lowest atomic states.’
    • ‘The answer, Zuckerwar explains, is that each one generates silent infrasound - long sound waves at a frequency below 20 hertz.’
    • ‘When the radio-wave frequency causing proton excitation is removed, the protons relax and return to their steady-state orientation.’
    • ‘We know that electrons in any molecule can only absorb radiation at certain frequencies.’
    • ‘The frequency of light emitted from atoms in an excited state is measured in emission spectroscopy.’
    • ‘If ten waves are made per second, then the frequency is said to be ten cycles per second, written as 10 cps.’
    • ‘The frequency of gamma rays is far too high and that of radio waves is far too low to interact with these kinds of vibrations.’
    • ‘The Doppler effect is a change in the frequency of sound waves caused by moving objects.’
    • ‘Thus de Broglie supposed that matter might also be related to the frequency of waves.’
    • ‘The electromagnetic spectrum describes all matter as wave frequencies.’
    • ‘The frequency of this vibration is a function of the cut and shape of the crystal.’
    • ‘Thus, in order to calculate the vibrational frequencies and the rotational constants of a molecule all that is is needed is the input.’
    1. 2.1The particular waveband at which radio signals are broadcast or transmitted.
      ‘a radio station on a single AM radio frequency’
      [mass noun] ‘a coding sequence to ensure that everyone changes frequency in the correct manner’
      • ‘Radio waves have different frequencies, and by tuning a radio receiver to a specific frequency you can pick up a specific signal.’
      • ‘What started with two women has grown to a network of six women who keep at least two radios on the same frequency at night.’
      • ‘This is due in part to the fact that VOA is broadcast only on short-wave frequencies.’
      • ‘Or we can listen to them through radio transmission on a special frequency that's unique for each airport.’
      • ‘He turned around and adjusted the frequency on his portable radio.’
      • ‘Pulses represent any celestial radio signal of a fixed frequency that is distinguishable above the background noise.’
      • ‘Transmitting on the frequency 100.9, the station devotes 60 per cent of its airtime to programmes in Tonga while the rest are in English.’
      • ‘This is a measure of how well the antenna will ‘pull in’ a signal at a specific frequency.’
      • ‘One radio was tuned to the tanker-control frequency and the other radio directly to the tanker.’
      • ‘Finally, he tuned his suit's radio to the frequency listed on the cover of the transmitter.’
      • ‘In short, it plugs into a headphones jack and transmits the signal over an FM frequency you choose.’
      • ‘New technology is allowing radio stations to offer digital and analog signals on the same frequency.’
      • ‘A carrier signal is a continuous signal of a fixed frequency.’
      • ‘In addition, Moore said, several group leaders were communicating by radio on a frequency the LAPD could monitor.’
      • ‘After 147 minutes, scientists detected a 20Hz shift in the frequency of the carrier signal, indicating, perhaps, that the probe had landed.’
      • ‘All FM radio stations transmit in a band of frequencies between 88 megahertz and 108 megahertz.’
      • ‘Suppose an FM radio station is assigned the broadcast frequency 100 MHz.’
      • ‘When you enter a road, you set your radio to the assigned frequency and monitor the traffic.’
      • ‘Prior to the establishment of the FCC, anybody with an antenna could send a radio signal on any frequency.’
      • ‘In full-duplex radio, the two transmitters use different frequencies, so both parties can talk at the same time.’

Origin

Mid 16th century (gradually superseding late Middle English frequence; originally denoting a gathering of people): from Latin frequentia, from frequens, frequent- crowded, frequent.

Pronunciation:

frequency

/ˈfriːkw(ə)nsi/