noun
reaction
A response to something or a process in which substances change chemically.
Her reaction to the surprise is a smile of delight.
Etymology
The word names an action in return. It covers a person’s response and the changes produced when substances act upon one another.
More examples
- Peanuts can cause a severe allergic reaction.
- Mixing vinegar and baking soda produces a chemical reaction.
- The proposal draws mixed reactions from the staff.
Forms
reaction · reactions
react verb — Respond to something or undergo chemical change.