Look up reaction in Wiktionary, the free dictionary.

Reaction may refer to:

• Response to another event
• Adverse drug reaction
• Chemical reaction
• Light reaction
• Nuclear reaction
• Reaction (physics), as defined by Newton's third law
• Reflex reaction
• Emotional reaction
• Reactionary, a political tendency

other uses

• Reaction Records, a record label
• ReAction GUI a GUI toolkit used on AmigaOS

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.