reactionpoint
nounUK /riˈækʃən pɔɪnt/
US /riˈækʃən pɔɪnt/
A reaction point is the exact spot where something happens or changes.
The teacher marked the reaction point on the map with a red dot.
OTHER MEANINGS
2. In chemistry, the place where a chemical change starts.
The scientist watched the reaction point where the two liquids met.
3. In a game, the moment when players must respond quickly.
The reaction point in the game came when the whistle blew.
4. A spot on a screen or surface that responds when touched.
Tap the reaction point on the screen to start the video.