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frequency

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.

DEFINITIONS OF: frequency

n 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”

Synonyms:: frequence, oftenness

Types:: show 19 types...; hide 19 types...; audio, audio frequency
an audible acoustic wave frequency; radio frequency
an electromagnetic wave frequency between audio and infrared; infrared, infrared frequency
the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range; wave number
the reciprocal of the wavelength of a wave; attendance
the frequency with which a person is present; count per minute, counts/minute
frequency per minute; sampling frequency
(telecommunication) the frequency of sampling a continuously varying signal; station
the frequency assigned to a broadcasting station; ELF, extremely low frequency
below 3 kilohertz; VLF, very low frequency
3 to 30 kilohertz; LF, low frequency
30 to 300 kilohertz; MF, medium frequency
300 to 3000 kilohertz; HF, high frequency
3 to 30 megahertz; VHF, very high frequency
30 to 300 megahertz; UHF, ultrahigh frequency
300 to 3000 megahertz; SHF, superhigh frequency
3 to 30 gigahertz; EHF, extremely high frequency
30 to 300 gigahertz; rydberg, rydberg constant, rydberg unit
a wave number characteristic of the wave spectrum of each element; Nyquist frequency
(telecommunication) twice the maximum frequency occurring in the transmitted signal

Type of:: rate
a magnitude or frequency relative to a time unit

n the number of observations in a given statistical category

Synonyms:: absolute frequency

Type of:: cardinal, cardinal number
the number of elements in a mathematical set; denotes a quantity but not the order

n the ratio of the number of observations in a statistical category to the total number of observations

Synonyms:: relative frequency

Types:: incidence, relative incidence
the relative frequency of occurrence of something; morbidity
the relative incidence of a particular disease

Type of:: ratio
the relative magnitudes of two quantities (usually expressed as a quotient)

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