# hertz

## Definitions

### General English

### Astronomy

- Unit of frequency, signifying one cycle (such as a complete wave of electromagnetic radiation) per second

### Aviation

- noun
(written as *Hertz*)

the SI unit of frequency, defined as the number of cycles per second of time.

### Construction

- A unit of
__measurement__ of frequency equal to one cycle per second.

### Electronics

- The
__SI__ unit of frequency. It is __equal__ to one complete cycle of a __periodic__ phenomenon, such as an electromagnetic wave, per second. Frequencies are expressed in multiples of hertz, such as kilohertz, __terahertz__, and so on. It is __equivalent__ to __cycles per second__, which is an obsolescent term. Hertz contrasts with becquerel, which measures __phenomena__ that occur in an unpredictable manner, such as __radioactive__ disintegrations. Its abbreviation is Hz.

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