Bedeutung von “reaction” im Essential American English Dictionary

reaction

noun us /riˈæk·ʃən/

something you say, feel, or do because of something that has happened:

What was his reaction to the news?
reactions

the ability to move quickly when something suddenly happens:

Drivers need to have quick reactions.

an unpleasant feeling or illness caused by something you have eaten or used on your body:

Some people have a / bad reaction to this drug.

(Definition von “reaction” aus dem Webster's Essential Mini Dictionary © Cambridge University Press)