| abreact | (verb) discharge bad feelings or tension through verbalization | - |
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| abreaction | (noun) (psychoanalysis) purging of emotional tensions | Synonyms: catharsis, katharsis |
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| deactivate | (verb) make inactive | Synonyms: inactivate |
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| (verb) remove from active military status or reassign | - |
| deactivation | (noun) the act of deactivating or making ineffective (as a bomb) | Synonyms: defusing |
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| (noun) breaking up a military unit (by transfers or discharges) | Synonyms: inactivation |
| overreact | (verb) show an exaggerated response to something | - |
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| overreaction | (noun) an excessive reaction; a reaction with inappropriate emotional behavior | - |
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| react | (verb) undergo a chemical reaction; react with another substance under certain conditions | - |
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| (verb) show a response or a reaction to something | Synonyms: respond |
| (verb) act against or in opposition to | Synonyms: oppose |
| reactance | (noun) opposition to the flow of electric current resulting from inductance and capacitance (rather than resistance) | - |
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| reactant | (noun) a chemical substance that is present at the start of a chemical reaction | - |
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| reaction | (noun) a bodily process occurring due to the effect of some antecedent stimulus or agent | Synonyms: response |
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| (noun) doing something in opposition to another way of doing it that you don't like | - |
| (noun) an idea evoked by some experience | - |
| (noun) extreme conservatism in political or social matters | - |
| (noun) (mechanics) the equal and opposite force that is produced when any force is applied to a body | - |
| (noun) a response that reveals a person's feelings or attitude | - |
| (noun) (chemistry) a process in which one or more substances are changed into others | Synonyms: chemical reaction |
| reactionary | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionist |
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| (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, ultraconservative |
| reactionism | (noun) the political orientation of reactionaries | - |
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| reactionist | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionary |
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| reactivate | (verb) activate (an old file) anew | - |
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| reactive | (adjective) participating readily in reactions | - |
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| (adjective) reacting to a stimulus | Synonyms: responsive |
| reactivity | (noun) responsive to stimulation | Synonyms: responsiveness |
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| (noun) ready susceptibility to chemical change | - |
| reactor | (noun) (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements | Synonyms: nuclear reactor |
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| (noun) an electrical device used to introduce reactance into a circuit | - |
| unreactive | (adjective) (chemistry) not reacting chemically | - |
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| (adjective) not tending to react to stimulation | - |