Synonyms of 'react'
1 respondDictionary, act, take
They reacted violently to the news.
He reacted very badly to the radiation therapy.
3 respondDictionary, answer, reply
4 workDictionary, operate, function
rise up against
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If you acknowledge a message or letter, you write to the person who sent it in order to say that you have received it.
They sent me a postcard acknowledging my request.
If someone acts in a particular way, they behave in that way.
a gang of youths who were acting suspiciously
Thesaurus for react from the Collins English Thesaurus
When you react to something that has happened to you, you behave in a particular way because of it.