noun, plural fre·quen·cies.
- the number of periods or regularly occurring events of any given kind in unit of time, usually in one second.
- the number of cycles or completed alternations per unit time of a wave or oscillation. Symbol: F; Abbreviation: freq.
Origin of frequency
Synonyms for frequency
Related Words for frequencyprevalence, density, number, recurrence, regularity, repetition, abundance, constancy, oscillation, beat, reiteration, iteration, rhythm, pulsation, persistence, periodicity
Examples from the Web for frequency
Contemporary Examples of frequency
That frequency is within the range used by amateur radio operators, so anyone can listen in.Luxembourg and China Team Up on Private Mission to the Moon
Matthew R. Francis
October 26, 2014
One of the biggest concerns in Europe is the frequency of air traffic with West Africa.Europe’s Hidden Ebola Cases
Barbie Latza Nadeau
October 15, 2014
Despairing about the length and frequency of the many fashion weeks has become a tired refrain.The Drama of Being a Model: Spike Jonze and Jonah Hill Land in Fashion Week
September 8, 2014
The bigger the black hole, the lower the frequency, much as it is with musical instruments.The Goldilocks of Black Holes
Matthew R. Francis
August 24, 2014
Dr. Greenberg also indicates that the frequency of splurges can change depending on where you are in relation to your goal.When Is It OK to Cheat? The Pros and Cons of Cheat Days
July 14, 2014
Historical Examples of frequency
The Indians, however, continued friendly with him and visited him with frequency.Green Mansions
W. H. Hudson
Maneuvering continues, but actual encounters have declined in frequency.The Outbreak of Peace
Horace Brown Fyfe
Is it the frequency of the punishment that has made you callous to the ignominy and the pain?
It will be necessary next for us to determine how far frequency 1.Modern Painters Volume I (of V)
The frequency with which they change their encampments is another point.
noun plural -cies
- the number of individuals in a class (absolute frequency)
- the ratio of this number to the total number of individuals under survey (relative frequency)
- the number of individuals of a species within a given area
- the percentage of quadrats that contains individuals of a species
Word Origin for frequency
1640s, "fact of occurring often," from Latin frequentia "a crowding, crowd," from frequentem (see frequent).
Earlier it had been used in a now-obsolete sense of "state of being crowded" (mid-16c.); sense in physics, "rate of recurrence," especially of a vibration, is from 1831. In radio electronics, frequency modulation (1922, abbreviated F.M.) as a system of broadcasting is distinguished from amplitude modulation (or A.M.).
In physics, the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz (Hz), corresponding to one crest per second. The frequency of a wave can be calculated by dividing the speed of the wave by the wavelength. Thus, in the electromagnetic spectrum, the wavelengths decrease as the frequencies increase, and vice versa.