Englishfor English speakers
signal
Noun
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A picture, or a light, or a movement of a hand, or other thing that tells people to do something.
When I make this signal with my hand, everybody walk to the front of the room.
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A picture, or a light, or a movement of a hand, or something else that lets someone recognize another person, a ship, an airplane or something else.
The sailor saw the signal on the other ship and so recognized it was the enemy.
signal
Verb
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When someone or something signals to someone, they use a signal to tell the person something.
The red light signals to the cars to stop.
element
Noun
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An element is one part of something bigger, such as a plan, an engine, or a business.
He's the best salesman on our team, but he's only one element in our success.
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An element is one basic kind of substance, such as iron (Fe) oxygen (O) or sodium (Na).
Water is made up of two elements: Hydrogen and Oxygen.