# magneto

/mæɡnˈiːtəʊ/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/magneto
Updated: 2026-05-11

## Definition

a small generator that uses magnets to create electricity for a spark. It is usually found in older engines or small machines like lawnmowers to help them start.

For teachers: an electrical generator that employs permanent magnets to produce periodic pulses of alternating current. Primarily used in ignition systems for internal combustion engines to provide high-voltage sparks.

## Examples

- The old tractor wouldn't start because the magneto was broken.
- Small engines, such as those on chainsaws and lawnmowers, often rely on a magneto rather than a battery for ignition.
- Early aircraft engines utilized a dual magneto system to ensure that the spark plugs would continue to fire even if one electrical circuit failed during flight.

## Usage notes

- Commonly used in mechanical and historical engineering contexts.

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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.