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词汇频率

frequency

(friːkwənsi )

词形 plural frequencies

1. 不可数名词

The frequency of an event is the number of times it happens during a particular period.

The frequency of Kara's phone calls increased rapidly. [+ of]

The tanks broke down with increasing frequency.

2. 有变体名词

In physics, the frequency of a sound wave or a radio wave is the number of times it vibrates within a specified period of time.

You can't hear waves of such a high frequency.

...a frequency of 24 kilohertz. [+ of]

...low frequency waves.

Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers

British English pronunciation

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American English pronunciation

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词汇频率

frequency in British English

(ˈfriːkwənsɪ )

名词词形 plural -cies

1. 

2. 

the number of times that an event occurs within a given period; rate of recurrence

3.  physics

the number of times that a periodic function or vibration repeats itself in a specified time, often 1 second. It is usually measured in hertz.

Symbol: ν, f

4.  statistics

a. 

the number of individuals in a class ( absolute frequency)

b. 

the ratio of this number to the total number of individuals under survey (relative frequency)

5.  ecology

a. 

the number of individuals of a species within a given area

b. 

Also called (for senses 1, 2): frequence

Collins English Dictionary. Copyright © HarperCollins Publishers

frequency 的词源

C16: from Latin frequentia a large gathering, from frequēns numerous, crowded

词汇频率

frequency in American English

(ˈfrikwənsi )

名词词形 plural frequenciesOrigin: ME < Fr < L frequentia < frequens: see frequent

1.  obsolete

b. 

a crowd

2. 

the fact of occurring often or repeatedly

3. 

the number of times any action or occurrence is repeated in a given period

4.  mathematics and statistics

a. 

the number of times an event, value, or characteristic occurs in a given period

b. 

the ratio of the number of times a characteristic occurs to the number of trials in which it can potentially occur

: in full: relative frequency

5.  physics

the number of periodic oscillations, vibrations, or waves per unit of time: usually expressed in hertz

Abbreviation: f

Also: frequence (ˈfrikwəns )

Webster’s New World College Dictionary, 5th Digital Edition. Copyright © 2025 HarperCollins Publishers.

词汇频率

frequency in American English

(ˈfrikwənsi)

名词词形 plural -cies

1.  Also: frequence

the state or fact of being frequent; frequent occurrence

We are alarmed by the frequency of fires in the neighborhood

2. 

rate of occurrence

The doctor has increased the frequency of his visits

3. Physics

a. 

the number of periods or regularly occurring events of any given kind in unit of time, usually in one second

b. 

the number of cycles or completed alternations per unit time of a wave or oscillation

Symbol: F. Abbreviation: freq.

4. Math

the number of times a value recurs in a unit change of the independent variable of a given function

SYNONYMS 1. regularity, repetition, recurrence.

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

frequency 的词源

[1545–55; ‹ L frequentia assembly, multitude, crowd. See frequent, -cy]

词汇频率

frequency in Electrical Engineering

(frikwənsi)

名词

(Electrical engineering: Circuits, Electrical power, Computing and control)

Electrical frequency is the number of complete cycles of an alternating voltage or current in a particular amount of time, measured in hertz.

A radio station pulses current through an antenna at the frequency it has been assigned, producing radio waves that propagate out from the antenna.

When the tube lights, the voltage and frequency across the tube and capacitor typically both drop, thus capacitor current falls to a low but non-zero value.

Electrical frequency is the number of complete cycles of an alternating voltage or current in a particular amount of time, measured in hertz.

frequency modulation, frequency response, frequency spectrum, high frequency, very high frequency

Collins COBUILD Key Words for Electrical Engineering. Copyright © HarperCollins Publishers

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