| / English Dictionary |
REACTION
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
Doing something in opposition to another way of doing it that you don't like
Example:
his style of painting was a reaction against cubism
Classified under:
Nouns denoting acts or actions
Hypernyms ("reaction" is a kind of...):
opposition; resistance (the action of opposing something that you disapprove or disagree with)
Hyponyms (each of the following is a kind of "reaction"):
backlash (an adverse reaction to some political or social occurrence)
Sense 2
Meaning:
A bodily process occurring due to the effect of some antecedent stimulus or agent
Example:
his responses have slowed with age
Synonyms:
Classified under:
Nouns denoting acts or actions
Hypernyms ("reaction" is a kind of...):
activity; bodily function; bodily process; body process (an organic process that takes place in the body)
Hyponyms (each of the following is a kind of "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)
answer (a nonverbal reaction)
passage; passing (a bodily reaction of changing from one place or stage to another)
learned reaction; learned response (a reaction that has been acquired by learning)
inborn reflex; innate reflex; instinctive reflex; physiological reaction; reflex; reflex action; reflex response; unconditioned reflex (an automatic instinctive unlearned reaction to a stimulus)
double take (a delayed reaction indicating surprise)
kinesis (a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation)
taxis (a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism)
tropism (an involuntary orienting response; positive or negative reaction to a stimulus source)
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)
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)
overreaction (an excessive reaction; a reaction with inappropriate emotional behavior)
rebound (a reaction to a crisis or setback or frustration)
automatism (any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy))
Derivation:
react (show a response or a reaction to something)
Sense 3
Meaning:
An idea evoked by some experience
Example:
his reaction to the news was to start planning what to do
Classified under:
Nouns denoting cognitive processes and contents
Hypernyms ("reaction" is a kind of...):
idea; thought (the content of cognition; the main thing you are thinking about)
Sense 4
Meaning:
Extreme conservatism in political or social matters
Example:
the forces of reaction carried the election
Classified under:
Nouns denoting cognitive processes and contents
Hypernyms ("reaction" is a kind of...):
conservatism; conservativism (a political or theological orientation advocating the preservation of the best in society and opposing radical changes)
Derivation:
reactionary (opposed to political or social liberalism or reform)
Sense 5
Meaning:
A response that reveals a person's feelings or attitude
Example:
John feared his mother's reaction when she saw the broken lamp
Classified under:
Nouns denoting natural phenomena
Hypernyms ("reaction" is a kind of...):
response (a result)
Derivation:
react (show a response or a reaction to something)
Sense 6
Meaning:
(mechanics) the equal and opposite force that is produced when any force is applied to a body
Example:
every action has an equal and opposite reaction
Classified under:
Nouns denoting natural phenomena
Hypernyms ("reaction" is a kind of...):
force ((physics) the influence that produces a change in a physical quantity)
Domain category:
mechanics (the branch of physics concerned with the motion of bodies in a frame of reference)
Sense 7
Meaning:
(chemistry) a process in which one or more substances are changed into others
Example:
there was a chemical reaction of the lime with the ground water
Synonyms:
chemical reaction; reaction
Classified under:
Nouns denoting natural processes
Hypernyms ("reaction" is a kind of...):
chemical action; chemical change; chemical process ((chemistry) any process determined by the atomic and molecular composition and structure of the substances involved)
Domain category:
chemical science; chemistry (the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions)
Hyponyms (each of the following is a kind of "reaction"):
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))
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)
photochemical reaction (a chemical reaction produced by the action of light)
oxidation-reduction; oxidoreduction; redox (a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction)
oxidation; oxidisation; oxidization (the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction)
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)
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)
exothermic reaction (a chemical reaction accompanied by the evolution of heat)
endothermic reaction (a chemical reaction accompanied by the absorption of heat)
elimination reaction (a chemical reaction in which a molecule decomposes to two different molecules)
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))
displacement; displacement reaction ((chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound)
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)
chemical equilibrium; equilibrium (a chemical reaction and its reverse proceed at equal rates)
chain reaction (a series of chemical reactions in which the product of one is a reactant in the next)
aldol reaction (a reaction of aldehydes resulting in an aldol)
addition reaction (a chemical reaction in which one molecule is added to another)
Derivation:
react (undergo a chemical reaction; react with another substance under certain conditions)
Context examples:
EXAMPLE(S): routine requirement, drug reaction, infectious disease reporting requirement, on patient request
(Activity Reason Code, NCI Thesaurus/BRIDG)
Specifies whether the adverse event or reaction term is a major concern or reason for reporting the adverse event.
(Adverse Event Highlighted Indicator, NCI Thesaurus)
The relative number of moles of one substance to another in a chemical reaction.
(Molar Ratio, NCI Thesaurus)
To reduce the risk of reactions and make sure that you get better, it is important for you to take your medicines correctly and be careful when giving medicines to children.
(Medicines, NIH)
I suppose it is the reaction from the terrible excitement.
(Dracula, by Bram Stoker)
“Very low,” said Mr. Micawber, shaking his head; “reaction. Ah, this has been a dreadful day! We stand alone now—everything is gone from us!”
(David Copperfield, by Charles Dickens)
The time for the reaction had come.
(Love of Life and Other Stories, by Jack London)
It is usually the result of a viral infection or an allergic reaction.
(Nasal Congestion, NCI Thesaurus)
It is further characterized by an inflammatory reaction in the glomerular capillaries due to the deposition of immune complexes and subsequent thickening of the glomerular basement membrane.
(Nephrotic Syndrome with Lesion of Membranous Glomerulonephritis, NCI Thesaurus)
A branch of chemistry that deals specifically with the structures, synthesis and reactions of natural compounds.
(Natural Products Chemistry, NCI Thesaurus)
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