noun

reaction

reaction, response

What was his reaction to the gift?

What was his reaction to the gift?

This is a common chemical reaction.

This is a common chemical reaction.

She had an allergic reaction to the nuts.

She had an allergic reaction to the nuts.

((to sth.)) a response to (sth.) What was his reaction to the gift?

((of sth.)) a chemical change of (sth.) We studied the reaction of sodium with water.

Synonyms: response, reply, answer

From the verb 'react', from Latin 're-' (back) + 'agere' (to act). An 'action back'.

A 'reaction' is the 'action' you take in 're'sponse to something.

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