Meaning of REACTION in English

REACTION

transcription, транскрипция: [ rē-ˈak-shən ]

noun

Date: circa 1611

1.

a. : the act or process or an instance of reacting

b. : resistance or opposition to a force, influence, or movement ; especially : tendency toward a former and usually outmoded political or social order or policy

2. : a response to some treatment, situation, or stimulus

her stunned reaction to the news

also : such a response expressed verbally

critical reaction to the play

3. : bodily response to or activity aroused by a stimulus:

a. : an action induced by vital resistance to another action ; especially : the response of tissues to a foreign substance (as an antigen or infective agent)

b. : depression or exhaustion due to excessive exertion or stimulation

c. : heightened activity and overaction succeeding depression or shock

d. : a mental or emotional disorder forming an individual's response to his or her life situation

4. : the force that a body subjected to the action of a force from another body exerts in the opposite direction

5.

a.

(1) : chemical transformation or change : the interaction of chemical entities

(2) : the state resulting from such a reaction

b. : a process involving change in atomic nuclei

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.