1. photochemical reaction

noun. A chemical reaction produced by the action of light.
Synonyms
reaction light reaction chemical reaction

2. reaction-propulsion engine

noun. A jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream.
Synonyms
reaction engine ion engine engine jet engine

3. reaction

noun. (riːˈækʃən) (chemistry) a process in which one or more substances are changed into others.
Synonyms
photochemical reaction endothermic reaction chemical decomposition reaction chemical reaction redox metathesis neutralisation decomposition reducing neutralization reaction oxidation neutralization chemical action double decomposition reaction chemical process hydrolysis chemical change displacement reaction aldol reaction saponification reduction displacement equilibrium chain reaction elimination reaction oxidization double decomposition exothermic reaction neutralisation reaction decomposition reaction oxidoreduction oxidation-reduction chemical equilibrium addition reaction oxidisation
Antonyms
unsatisfactory voluntary fall short of disagree question
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)

4. reaction

noun. (riːˈækʃən) An idea evoked by some experience.
Synonyms
thought idea
Antonyms
inactiveness dormant inaction
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)

5. reaction

noun. (riːˈækʃən) A bodily process occurring due to the effect of some antecedent stimulus or agent.
Synonyms
taxis galvanic skin response psychogalvanic response physiological reaction bodily process electrodermal response innate reflex passage double take tropism inborn reflex learned response transfusion reaction activity reflex action unconditioned reflex kinesis overreaction rebound bodily function passing electrical skin response reflex response immunologic response Tarchanoff phenomenon automatism learned reaction reflex immune response answer immune reaction GSR response Fere phenomenon instinctive reflex body process
Antonyms
inactivity discontinuance activation sink source
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)

6. reaction

noun. (riːˈækʃən) Extreme conservatism in political or social matters.
Synonyms
conservativism conservatism
Antonyms
passive active birth
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)

7. reaction

noun. (riːˈækʃən) (mechanics) the equal and opposite force that is produced when any force is applied to a body.
Synonyms
force
Antonyms
failing running
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)

8. reaction

noun. (riːˈækʃən) Doing something in opposition to another way of doing it that you don't like.
Synonyms
opposition resistance backlash
Antonyms
peristalsis anastalsis assembly discontinuation
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)

9. reaction

noun. (riːˈækʃən) A response that reveals a person's feelings or attitude.
Synonyms
response
Antonyms
permanent careful
Etymology
reaction (English)
reaction (Old French (842-ca. 1400))
reactio (Latin)
actio (Latin)
-tio (Latin)
actum (Latin)
ago (Latin)
actus (Latin)
re- (Latin)
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