Technology / A2

SIGN-uh-l/ˈsɪɡnəl/

A signal is a light, sound, or movement that sends a message: a turn signal, a smoke signal, give a signal. Sign is often written or fixed (a road sign); a signal is often for the moment. Wave can be a kind of signal. Do not write single (only one) for signal.

Meaning

A sound, light, or movement that sends a message.

Examples

• “The cyclist gave a signal before she turned left.”
• “A red signal stopped the train at the bridge.”
• “He waited for the referee’s signal to start.”

Good to know

give a signal / a red signal. Contrast: sign (written/fixed). Mix-up: single.

Topics

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