Reaction

/riˈækʃən/

Meaning & Definition

noun
a response to a stimulus or an event.
Her reaction to the news was one of surprise and disbelief.
a chemical change resulting from a physical or chemical process.
The reaction between the acid and base produced a lot of heat.
an action taken in response to something.
His reaction to the criticism was to improve his work.

Etymology

From Latin 'reactio', from 're-' meaning 'back' and 'agere' meaning 'to act'.

Common Phrases and Expressions

knee-jerk reaction
An automatic or unthinking response.
overreaction
An excessive or exaggerated response.
chain reaction
A series of events causing each other.
reaction time
The time taken to respond to a stimulus.
positive reaction
A favorable response to something.

Related Words

act
To take action or do something.
stimulus
Something that incites or quickens action.
response
A reply or answer; a reaction.
counter
To act against something.
feedback
Information about reactions to a product or a person's performance.

Slang Meanings

The vibe or energy someone gives off in response to something.
His reaction to the prank was pure gold.
A reference to emotional responses in online discussions.
Her reaction videos always go viral.
An exaggerated response, often for comedic effect.
That was such a meme reaction.
When someone reacts in a way that is unexpected or funny.
Did you see his reaction? It was lit!