- A circuit, device, register, mechanism, or system used for counting. For example, a counter may store and/or indicate a given total, such as a number of pulses, Web site hits, changes in state, and so on.
- A circuit which generates an output after counting a specified number of pulses. Also called counter circuit, or counting circuit.
- An instrument which registers and counts ionizing radiation, such as alpha rays, given off by radioactive entities. For example, a Geiger counter or a scintillation counter. Also called radiation counter, ionization counter, or particle counter (1).
- In computer programming, a variable that keeps track of a running count.
- synonym counting circuit
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