1. responses to something that has happened or been said
Usage: plural of reaction
2. chemical processes in which substances interact to form new compounds
Usage: chemistry; plural of reaction
3. physical responses of the body to stimuli or substances
Usage: medical; plural of reaction

Examples

• The audience’s reactions to the play were overwhelmingly positive.
• She studied the different reactions people had to the news.
• The lab experiment produced several unexpected chemical reactions.
• Mixing those two substances causes dangerous reactions.
• He had severe allergic reactions to certain foods.
• The medication can cause adverse reactions in some patients.
• Their reactions to the surprise party were priceless.