| 单词 | frequency |
| 释义 | frequency (once / 1170 pages) n Frequency measures how often things repeat over time. City buses often reach stops at a frequency of every 15 minutes, unless it's snowing or raining really hard. In that case, the frequency will slow. You probably know the word frequent, a synonym for often. So, it is tempting to think frequency describes something that happens often. However, this isn't true: frequency describes any rate of time at which something repeats. For example, from Earth, Halley's Comet is visible at a frequency of 76 years — it's not frequent, but it is on schedule. WORD FAMILYfrequency: frequencies+/frequence: frequences/frequent: frequence, frequency, frequentative, frequented, frequenter, frequenting, frequently, frequents, infrequent/frequentative: frequentatives/frequented: unfrequented/frequenter: frequenters/infrequent: infrequency, infrequenter, infrequently/unfrequented: unfrequentedest, unfrequentedly USAGE EXAMPLESThe time created by the clocks is used in GPS location devices and is used to control the wave frequency of television broadcasts. BBC(Dec 30, 2016) Lastly, there is an interesting game that uses instant messaging as its main interface: Frequency. New York Times(Dec 28, 2016) The organization, a state-sponsored agency, bases its yearly choices on significance, rather than frequency. New York Times(Dec 28, 2016) 1n the number of occurrences within a given time period the frequency of modulation was 40 cycles per second the frequency of his seizures increased as he grew older Syn|Hypo|Hyper frequence, oftenness audio, audio frequency an audible acoustic wave frequency radio frequencyan electromagnetic wave frequency between audio and infrared infrared, infrared frequencythe infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range wave numberthe reciprocal of the wavelength of a wave attendancethe frequency with which a person is present count per minute, counts/minutefrequency per minute sampling frequency(telecommunication) the frequency of sampling a continuously varying signal stationthe frequency assigned to a broadcasting station ELF, extremely low frequencybelow 3 kilohertz VLF, very low frequency3 to 30 kilohertz LF, low frequency30 to 300 kilohertz MF, medium frequency300 to 3000 kilohertz HF, high frequency3 to 30 megahertz VHF, very high frequency30 to 300 megahertz UHF, ultrahigh frequency300 to 3000 megahertz SHF, superhigh frequency3 to 30 gigahertz EHF, extremely high frequency30 to 300 gigahertz rydberg, rydberg constant, rydberg unita wave number characteristic of the wave spectrum of each element Nyquist frequency(telecommunication) twice the maximum frequency occurring in the transmitted signal rate a magnitude or frequency relative to a time unit 2n the number of observations in a given statistical category Syn|Hyper absolute frequency cardinal, cardinal number the number of elements in a mathematical set; denotes a quantity but not the order 3n the ratio of the number of observations in a statistical category to the total number of observations Syn|Hypo|Hyper relative frequency incidence, relative incidence the relative frequency of occurrence of something morbiditythe relative incidence of a particular disease ratio the relative magnitudes of two quantities (usually expressed as a quotient) |
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