reaction

1. (chemistry) a process in which one or more substances are changed into others (synset 113468534)
   "there was a chemical reaction of the lime with the ground water"
   referred to in: chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
   is a type of: chemical action, chemical change, chemical process - (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
   subtypes:

   • addition reaction - a chemical reaction in which one molecule is added to another
   • aldol reaction - a reaction of aldehydes resulting in an aldol
   • chain reaction - a series of chemical reactions in which the product of one is a reactant in the next
   • chemical equilibrium, equilibrium - a chemical reaction and its reverse proceed at equal rates
   • chemical decomposition reaction, decomposition, decomposition reaction - (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
   • displacement, displacement reaction - (chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound
   • double decomposition, double decomposition reaction, metathesis - a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)
   • elimination reaction - a chemical reaction in which a molecule decomposes to two different molecules
   • endothermic reaction - a chemical reaction accompanied by the absorption of heat
   • exothermic reaction - a chemical reaction accompanied by the evolution of heat
   • hydrolysis - a chemical reaction in which water reacts with a compound to produce other compounds; involves the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion from the water
   • neutralisation, neutralisation reaction, neutralization, neutralization reaction - a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water
   • oxidation, oxidisation, oxidization - the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction
   • oxidation-reduction, oxidoreduction, redox - a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction
   • photochemical reaction - a chemical reaction produced by the action of light
   • reducing, reduction - any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent
   • saponification - a chemical reaction in which an ester is heated with an alkali (especially the alkaline hydrolysis of a fat or oil to make soap)
   same as: chemical reaction
2. An idea evoked by some experience (synset 105925922)
   "his reaction to the news was to start planning what to do"
   is a type of: idea, thought - the content of cognition; the main thing you are thinking about
3. A bodily process occurring due to the effect of some antecedent stimulus or agent (synset 100860679)
   "a bad reaction to the medicine"; "his responses have slowed with age"
   is a type of: activity, bodily function, bodily process, body process - an organic process that takes place in the body
   subtypes:

   • automatism - any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy)
   • rebound - a reaction to a crisis or setback or frustration
   • overreaction - an excessive reaction; a reaction with inappropriate emotional behavior
   • electrical skin response, electrodermal response, fere phenomenon, galvanic skin response, gsr, psychogalvanic response, tarchanoff phenomenon - a change in the electrical properties of the skin in response to stress or anxiety; can be measured either by recording the electrical resistance of the skin or by recording weak currents generated by the body
   • immune reaction, immune response, immunologic response - a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen
   • tropism - an involuntary orienting response; positive or negative reaction to a stimulus source
   • taxis - a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism
   • kinesis - a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation
   • double take - a delayed reaction indicating surprise
   • inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex - an automatic instinctive unlearned reaction to a stimulus
   • learned reaction, learned response - a reaction that has been acquired by learning
   • passage, passing - a bodily reaction of changing from one place or stage to another
   • answer - a nonverbal reaction
   • transfusion reaction - reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death
   same as: response
4. (mechanics) the equal and opposite force that is produced when any force is applied to a body (synset 111518861)
   "every action has an equal and opposite reaction"
   referred to in: mechanics - the branch of physics concerned with the motion of bodies in a frame of reference
   is a type of: force - (physics) the influence that produces a change in a physical quantity
5. A response that reveals a person's feelings or attitude (synset 111437243)
   "he was pleased by the audience's reaction to his performance"; "John feared his mother's reaction when she saw the broken lamp"
   is a type of: response - a result
6. Extreme conservatism in political or social matters (synset 106226571)
   "the forces of reaction carried the election"
   is a type of: conservatism, conservativism - a political or theological orientation advocating the preservation of the best in society and opposing radical changes
7. Doing something in opposition to another way of doing it that you don't like (synset 100203665)
   "his style of painting was a reaction against cubism"
   is a type of: opposition, resistance - the action of opposing something that you disapprove or disagree with
   subtypes: backlash - an adverse reaction to some political or social occurrence

Other Searches

• Rhyme: Dillfrog, RhymeZone
• Definition: Wiktionary, Dictionary.com, Wikipedia, Merriam-Webster, WordNet, Power Thesaurus
• Imagery: Google, Flickr, Bing