Definition of react in English:

react

verb

[NO OBJECT]
  • 1Act in response to something; respond in a particular way:

    ‘he reacted angrily to the news of his dismissal’
    ‘the market reacted by falling a further 3.1%’
    • ‘Finally, we examine whether investors react rationally to disaster announcements.’
    • ‘I honestly can't imagine why no one on the show reacts in a similar fashion.’
    • ‘All my three daughters react differently to stress.’
    • ‘Rail passengers have reacted angrily to news that fares are set to rise.’
    • ‘Ward councillors have reacted with dismay, saying it will mean the end of historical links.’
    • ‘One reason is that financial markets react quickly to policy changes.’
    • ‘But the links are just harder to study, because everybody reacts to stress differently.’
    • ‘United fans reacted with fury at the announcement.’
    • ‘But Edinburgh City Council has reacted angrily to suggestions that they may have deliberately clogged the streets.’
    • ‘Why did the government react so violently to the report?’
    • ‘If other readers react in the same way as I did, then this collection will have served its purpose.’
    • ‘According to critics, established Democratic consultants are not reacting fast enough to changing conditions.’
    • ‘Males reacted equally strongly to both stimuli for all four parameters.’
    • ‘Their daughter was told about the explosion and reacted with shock when she arrived.’
    • ‘Do you think a bunch of guys would have reacted in the same manner?’
    • ‘Sun's shares quickly fell by about 6 per cent in after-hours trading, as investors reacted to the quarterly report.’
    • ‘Your body was reacting the way it was designed to do - with pleasure.’
    • ‘The powers-that-be are scrambling to react to pressure from a dissatisfied public.’
    • ‘Gay political groups have reacted with horror, attacking the lead researcher himself as biased.’
    • ‘Most people would react negatively to these situations and Ian was no exception.’
    behave, act, take it, conduct oneself, proceed
    rebel against, oppose, revolt against, rise up against
    View synonyms
    1. 1.1react against Respond with hostility or a contrary course of action to:
      ‘they reacted against the elite art music of their time’
      • ‘Plus, people who fervently believe in stupid ideas have a quite consistent track record into reacting against dissent with violence.’
      • ‘The French have reacted against a document they think is an Anglo-Saxon plot to move away from a ‘social’ Europe.’
      • ‘‘We've reacted against what's happened in those big studios,’ says Shaw.’
      • ‘Workers reacted against the outrageous contract demands of the company, voting by an overwhelming 48 to 3 for strike action.’
      • ‘The second neat thing we learn is that the rioters aren't reacting against capitalism.’
      • ‘Superficially he reacted against this background.’
      • ‘And, once again, traditionalists are reacting against globalization just as vehemently, if not more so, as they did against modernity.’
      • ‘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.’
      • ‘How do we react against such violence and war in our time?’
      • ‘It seems to be reacting against the conventional attitudes of intellectuals at least those raised in the Western tradition.’
      • ‘There appears to be a growing disquiet about the recent actions and opinions of America that many people are reacting against.’
      • ‘So post-punk is music which is reacting against punk, consciously trying to move beyond it.’
      • ‘The positive side being, they could not be stopped from reacting against portions they disliked.’
      • ‘Whether you are repeating them or reacting against them could be explored further.’
      • ‘I cannot help reacting against all the negative criticism of the regime that one hears in England.’
      • ‘But at least it tried to offer what it thought was a coherent alternative to the society it was reacting against.’
      • ‘A lot of the Victoria bands that started around 2000 were reacting against the insular hardcore scene out there.’
      • ‘Third, many people in the younger generation, under age 30 or so, are reacting against the culture of divorce.’
      • ‘We were reacting against bands we considered to be turgid and boring.’
      • ‘In part, that is what Muslim fundamentalists are reacting against.’
    2. 1.2 Suffer from adverse physiological effects after ingesting, breathing, or touching a substance:
      ‘many babies react to soy-based formulas’
      • ‘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.’
      • ‘Our findings indicate that children at risk for atopy react sensitively to chemical substances that originate from passive smoking.’
      • ‘Therefore you can suddenly react to a substance you may have come in contact with many times before.’
      • ‘Those who react to airborne allergens usually have allergic rhinitis and/or allergic conjunctivitis.’
      • ‘Why do some members of a family react to environmental substances and develop asthma, while others do not?’
    3. 1.3Stock Market (of share prices) fall after rising:
      ‘the shares reacted to 222p before rallying to 228p’
      • ‘The market reacted badly to the news and sent the shares 17 % lower.’
      • ‘The stock price is reacting, up some 50 percent to $15 a share since Payne took charge.’
      • ‘Just how will bond markets and stock markets react to the anticipated rise in US interest rates?’
      • ‘The market reacted positively to the news, pushing BHP's price up 1.5 per cent, to $17.42.’
      • ‘Edging down a bit from record highs, but maybe not for long, oil prices react to events in Iraq.’
  • 2Physics Chemistry
    Interact and undergo a chemical or physical change:

    ‘the sulphur 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.’
    • ‘Direct sensing mechanisms might involve proteins or ligands that bind or react with oxygen.’
    • ‘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.’
    • ‘In these reactions the ozone reacts with nitric oxide to produce nitrogen dioxide.’
    1. 2.1[with object] Cause (a substance) to undergo a chemical or physical change by interacting with another substance:
      ‘in the new process the ammonia will be reacted with oxygen’
      • ‘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.’
      • ‘It is made into MSG by reacting the glutamic acid crystals with sodium hydroxide.’
      • ‘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.’
      • ‘Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene.’

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

/rɪˈakt/