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reactionary
reactive
reactor
read
read into
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read-only memory
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read-through
read up
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readability
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react

re·act [ ree ákt ] (past and past participle re·act·ed, present participle re·act·ing, 3rd person present singular re·acts)


intransitive verb 
Definition:
 
1. respond emotionally: to respond to something by showing the feelings or thoughts it arouses
Officials reacted with guarded optimism.

2. respond by taking action: to respond to something by taking action
The government reacted by sending in troops.

3. be in opposition: to act in opposition to somebody or something
children reacting against their parents

4. undergo physical response: to respond to the physical effects of something such as a medication or air pollution

5. chemistry change chemically: to undergo a chemical reaction

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