react

Pronunciation: /ɹiːˈækt/

The English word “react” has 7 meanings listed here.

verb

To act in response.
To act or perform a second time; to do over again; to reenact.
To return an impulse or impression; to resist the action of another body by an opposite force
To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.
To cause chemical agents to react; to cause one chemical agent to react with another.
To post a reaction (icon or emoji indicating how one feels about a posted message).

From re- + act. Piecewise doublet of redact.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.