Definition of react in US English:

react

verb

[no object]
  • 1Respond or behave in a particular way in response to something.

    ‘he reacted angrily to the news of his dismissal’
    ‘the market reacted by falling a further 3.1%’
    • ‘Most people would react negatively to these situations and Ian was no exception.’
    • ‘Why did the government react so violently to the report?’
    • ‘But Edinburgh City Council has reacted angrily to suggestions that they may have deliberately clogged the streets.’
    • ‘If other readers react in the same way as I did, then this collection will have served its purpose.’
    • ‘Males reacted equally strongly to both stimuli for all four parameters.’
    • ‘Your body was reacting the way it was designed to do - with pleasure.’
    • ‘One reason is that financial markets react quickly to policy changes.’
    • ‘United fans reacted with fury at the announcement.’
    • ‘Rail passengers have reacted angrily to news that fares are set to rise.’
    • ‘Gay political groups have reacted with horror, attacking the lead researcher himself as biased.’
    • ‘All my three daughters react differently to stress.’
    • ‘I honestly can't imagine why no one on the show reacts in a similar fashion.’
    • ‘Do you think a bunch of guys would have reacted in the same manner?’
    • ‘Finally, we examine whether investors react rationally to disaster announcements.’
    • ‘Their daughter was told about the explosion and reacted with shock when she arrived.’
    • ‘Sun's shares quickly fell by about 6 per cent in after-hours trading, as investors reacted to the quarterly report.’
    • ‘Ward councillors have reacted with dismay, saying it will mean the end of historical links.’
    • ‘According to critics, established Democratic consultants are not reacting fast enough to changing conditions.’
    • ‘But the links are just harder to study, because everybody reacts to stress differently.’
    • ‘The powers-that-be are scrambling to react to pressure from a dissatisfied public.’
    behave, act, take it, conduct oneself, proceed
    rebel against, oppose, revolt against, rise up against
    View synonyms
    1. 1.1react against Respond with hostility, opposition, or a contrary course of action to.
      ‘they reacted against the elite art music of their time’
      • ‘How do we react against such violence and war in our time?’
      • ‘‘We've reacted against what's happened in those big studios,’ says Shaw.’
      • ‘Third, many people in the younger generation, under age 30 or so, are reacting against the culture of divorce.’
      • ‘A lot of the Victoria bands that started around 2000 were reacting against the insular hardcore scene out there.’
      • ‘But at least it tried to offer what it thought was a coherent alternative to the society it was reacting against.’
      • ‘The second neat thing we learn is that the rioters aren't reacting against capitalism.’
      • ‘There appears to be a growing disquiet about the recent actions and opinions of America that many people are reacting against.’
      • ‘I cannot help reacting against all the negative criticism of the regime that one hears in England.’
      • ‘Whether you are repeating them or reacting against them could be explored further.’
      • ‘Superficially he reacted against this background.’
      • ‘He is a player who gets a lot of challenges against him and he has to resist reacting against them and keep playing the game.’
      • ‘The French have reacted against a document they think is an Anglo-Saxon plot to move away from a ‘social’ Europe.’
      • ‘Workers reacted against the outrageous contract demands of the company, voting by an overwhelming 48 to 3 for strike action.’
      • ‘It seems to be reacting against the conventional attitudes of intellectuals at least those raised in the Western tradition.’
      • ‘In part, that is what Muslim fundamentalists are reacting against.’
      • ‘So post-punk is music which is reacting against punk, consciously trying to move beyond it.’
      • ‘And, once again, traditionalists are reacting against globalization just as vehemently, if not more so, as they did against modernity.’
      • ‘Plus, people who fervently believe in stupid ideas have a quite consistent track record into reacting against dissent with violence.’
      • ‘We were reacting against bands we considered to be turgid and boring.’
      • ‘The positive side being, they could not be stopped from reacting against portions they disliked.’
    2. 1.2 (of a person) suffer from adverse physiological effects after ingesting, breathing, or touching a substance.
      ‘many babies react to soy-based formulas’
      • ‘Our findings indicate that children at risk for atopy react sensitively to chemical substances that originate from passive smoking.’
      • ‘Those who react to airborne allergens usually have allergic rhinitis and/or allergic conjunctivitis.’
      • ‘Therefore you can suddenly react to a substance you may have come in contact with many times before.’
      • ‘One of the hardest questions for parents of a young child to answer is whether to have them further immunized when he or she has reacted to a vaccination in the past.’
      • ‘Why do some members of a family react to environmental substances and develop asthma, while others do not?’
    3. 1.3Physics Chemistry Interact and undergo a chemical or physical change.
      ‘the sulfur in the coal reacts with the limestone during combustion’
      • ‘When base is added, it reacts with hydronium ion to decrease its concentration, thereby stressing the system.’
      • ‘In these reactions the ozone reacts with nitric oxide to produce nitrogen dioxide.’
      • ‘Thus, it is unsurprising that rubisco still reacts with both oxygen and carbon dioxide.’
      • ‘At higher temperatures, magnesium reacts vigorously with oxygen to produce a blinding white light.’
      • ‘Direct sensing mechanisms might involve proteins or ligands that bind or react with oxygen.’
    4. 1.4Chemistry with object Cause (a substance) to undergo a change by interacting with another substance.
      • ‘Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene.’
      • ‘Chloroform can be made from ethanol by reacting the ethanol with calcium hypochlorite.’
      • ‘These materials are reacted with sulfuric acid, then neutralized, and converted to a salt.’
      • ‘It is made into MSG by reacting the glutamic acid crystals with sodium hydroxide.’
      • ‘Organic sulfates are esters and are formed by reacting an alcohol with cold sulfuric acid or by the reaction of sulfuric acid with a double bond in an alkene.’
    5. 1.5Stock Market (of stock prices) fall or rise in reaction to events, developments, etc.
      • ‘The market reacted positively to the news, pushing BHP's price up 1.5 per cent, to $17.42.’
      • ‘The stock price is reacting, up some 50 percent to $15 a share since Payne took charge.’
      • ‘Edging down a bit from record highs, but maybe not for long, oil prices react to events in Iraq.’
      • ‘Just how will bond markets and stock markets react to the anticipated rise in US interest rates?’
      • ‘The market reacted badly to the news and sent the shares 17 % lower.’

Origin

Mid 17th century: from re- (expressing intensive force or reversal) + act, originally suggested by medieval Latin react- ‘done again’, from the verb reagere.

Pronunciation

react

/rēˈakt//riˈækt/