## Concept information

### Preferred term

frequency

### Definition

- [SWEET] The rate of recurrence of any periodic phenomenon, often associated with waves of all kinds. Without qualification frequency often means temporal frequency, the rate of recurrence of a time-varying function, but could mean spatial frequency, the rate of recurrence of a space-varying function. Spatial frequency is the reciprocal of the repeat distance (sometimes the wavelength). The dimensions of (temporal) frequency are inverse time. A common unit for frequency is cycle per second, formerly abbreviated cps, but superseded by hertz, abbreviated as Hz.

### Broader concept

### Entry terms

- T-1

### Creator

- herbert.schentz@umweltbundesamt.at

### URI

http://vocabs.lter-europe.net/EnvThes/21540

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