This is the 16274th most frequent Russian word.
реакцию
"Reaction."
The word 'реакцию' is used to denote the emotional or behavioral response of a person or group to a specific stimulus, in this case, a joke.
Он внимательно наблюдал нашу реакцию на его шутку.
He carefully observed our reaction to his joke.
Here, 'реакцию' refers to the chemical response occurring between substances in an experiment.
В химическом эксперименте ученик изучал реакцию различных веществ.
During the chemistry experiment, the student studied the reaction of various substances.
'Реакцию' in this example describes the collective response of an audience to a specific action or event.