Signal

/ˈsɪɡnəl/

Meaning & Definition

noun

A gesture, action, or sound that is used to convey information or instructions.

He raised his hand as a signal for the meeting to start.

A physical quantity whose value can change to convey information.

The radio station broadcasts a signal that can be picked up by any compatible radio.

A sign or indication of something.

The darkening sky was a signal that a storm was approaching.

verb

To communicate or indicate something through a gesture, action, or sound.

She signaled to him to come over.

To send or transmit a message or communication, especially by electronic means.

The device can signal the operator if there is a malfunction.

Middle English, from Latin 'signalis', from 'signum' meaning 'sign'.

signal to noise ratio

A measure used to compare the level of a desired signal to the level of background noise.

signal for help

A gesture or action indicating that assistance is needed.

send a clear signal

To communicate something in an unmistakable way.

sign

A mark or indication.

indicator

Something that provides information.

communication

The act of conveying information.

A sign of approval or agreement.

He gave me the signal to go ahead with the plan.

A way to express interest or intention.

She sent out a signal that she wanted to hang out.