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English definition of “calm”

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calm

adjective [-er/-est only]  /kɑm, kɑlm/ us  
peaceful, quiet, or relaxed; without hurried movement, anxiety, or noise: The pilot said we’d have to make an emergency landing, and the flight attendants tried to keep us calm. If weather is described as calm, it is not windy, and if the sea is described as calm, it is still or has only small waves: Our ship arrived at the Mississippi delta on a calm, clear night.
calm
noun [U]  /kɑm, kɑlm/ us  
Amid the calm, there was a sense that something could happen at any moment.
calmly
adverb  /ˈkɑm·li, ˈkɑlm-/ us  
He calmly made both free throws to win the game.
calmness
noun [U]  /ˈkɑm·nəs, ˈkɑlm-/ us  
The calmness and professionalism of the crew gave us confidence.

calm

verb [I/T]  /kɑm, kɑlm/ us  
to lessen someone's anxiety or make them more peaceful, quiet, or relaxed: [T] He tried his best to calm her (down). [I] I needed some time to calm down.
(Definition of calm from the Cambridge Academic Content Dictionary © Cambridge University Press)
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