Noun

(en noun)

An action or statement in response to a stimulus or other event

The announcement of the verdict brought a violent reaction .

You were in the courtroom. What is your reaction ?

When I last tried to eat strawberries I had a terrible allergic reaction .

(chemistry) A transformation in which one or more substances is converted into another by combination or decomposition

In this reaction , the acid and base will neutralize each other, producing a salt.

Noun

(wikipedia thought) (en noun)

Form created in the mind, rather than the forms perceived through the five senses; an instance of thinking.

*

, title=(The Celebrity), chapter=8 , passage=I corralled the judge, and we started off across the fields, in no very mild state of fear of that gentleman's wife, whose vigilance was seldom relaxed. And thus we came by a circuitous route to Mohair, the judge occupied by his own guilty thoughts , and I by others not less disturbing.}}

* , chapter=5

, title= The Mirror and the Lamp , passage=He was thinking; but the glory of the song, the swell from the great organ, the clustered lights, […], the height and vastness of this noble fane, its antiquity and its strength—all these things seemed to have their part as causes of the thrilling emotion that accompanied his thoughts .}}

(uncountable) The process by which such forms arise or are manipulated; thinking.

* (Paul Fix)

The only reason some people get lost in thought is because it’s unfamiliar territory.

A way of thinking (associated with a group, nation or region).