reaction

noun
UK /riˈækʃən/
US /riˈækʃən/

Something you do or feel because of something else that happened.

Her reaction to the surprise party was a big smile.


OTHER MEANINGS

2. A change that happens when two chemicals are mixed together.

The science experiment caused a colorful reaction in the glass.

3. A way your body fights off something harmful, like a germ or a food.

He had an allergic reaction to the peanuts.

4. A sudden change in how you feel or act, often showing strong emotion.

The crowd's reaction to the goal was loud cheering.