Englishfor English speakers
stimulus
Noun
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A stimulus is an event that causes a system to change its output or behavior.
The primary goal of the $31 billion economic stimulus package was to increase job growth.
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A stimulus is something that is noticed by the senses.
The mice responded with fear to the painful stimulus.
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.