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react  (reacts 3rd person present) (reacting present participle) (reacted past tense & past participle )
1  verb When you react to  something that has happened to you, you behave in a particular way because of it.  (=respond) 
They reacted violently to the news...  V to n 
It's natural to react with disbelief if your child is accused of bullying...  V adv/prep, Also V 
2  verb If you react against someone's way of behaving, you deliberately behave in a different way because you do not like the way they behave.  (=rebel) 
My father never saved and perhaps I reacted against that.  V against n 
3  verb If you react to  a substance such as a drug, or  to  something you have touched, you are affected unpleasantly or made ill by it. 
Someone allergic to milk is likely to react to cheese...  V to n, Also V 
4  v-recip When one chemical substance reacts with  another, or when two chemical substances  react, they combine chemically to form another substance. 
Calcium reacts with water...  V with n 
Under normal circumstances, these two gases react readily to produce carbon dioxide and water.  pl-n V 



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