# emitter

/ɪˈmɪtɝ/ (US) · /ɪmˈɪtɐ/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/emitter
Updated: 2026-05-19

## Definition

a device or part that sends out a signal, light, or heat. You often see this word in electronics when talking about things like light bulbs or radio transmitters.

For teachers: a device or component that transmits or emits a signal, radiation, or energy. Often used in the context of electronics and physics to describe the source of a specific output.

## Examples

- The light emitter in the lamp is broken.
- The radio station uses a powerful antenna as an emitter to broadcast its signal across the entire country.
- In modern display technology, the emitter is responsible for converting electrical signals into visible light, ensuring that the image remains sharp and vibrant on the screen.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.