Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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ri aekt
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part of speech: verb
inflections: reacts, reacting, reacted
definition 1: to act, or feel a certain way, in response to something.
I reacted to the sad movie by crying.I thought he might be angry when I said that, but he didn't react at all.
definition 2: to undergo chemical change when combined.
Rust is formed when iron reacts with hydrogen and oxygen.
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The word react contains the following parts:
re- Latin prefix that means again; back or back again
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The prefix re- occurs in verbs that are Latin loanwords, where it can mean "again" (revise ) or "back again" (reflect ). It also attaches to English verbs (replay, rewind) with both meanings. Any verb can be prefixed by "re- " to indicate that an action is repeated. No hyphen is necessary unless the word formed is identical to an existing word (re-sign the document, but resign from a job).