What does reacted mean?
“Reacted” is the past tense and past participle of “react,” meaning to respond to a situation, event, person, or stimulus. In everyday language, it describes how someone responds emotionally or behaviorally: a reader reacted with shock, or a politician reacted angrily to criticism. The word can also have a more technical meaning, especially in science, where one substance reacts chemically with another or a material responds to heat, light, or another influence. In another less common usage, “reacted” means to resist or oppose something. As an inflected form, it usually appears in narration, reported speech, and the second clause of a perfect construction, as in “She reacted to the news” or “They have reacted strongly.” It is standard in both British and American English.
To respond to a person, event, situation, or stimulus, especially by taking a particular action or developing a particular feeling.
"He reacted immediately when the alarm sounded."
Standard in formal and informal English; the emotional or behavioral response is the most common everyday sense.
To undergo a physical or chemical change in response to a stimulus.
"The two chemicals reacted to form a new substance."
This sense is common in scientific and technical writing.
To oppose or resist something, especially a proposal, policy, or action.
"Members of the committee reacted against the proposed changes."
This is less common than the ordinary sense of responding and tends to occur in formal or political contexts.
The word “reacted” carries a scientific echo: just as chemicals react when combined, people react when circumstances trigger a response.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does reacted come from?
The word comes from the Latin verb “reactus,” a past participle of “reagere,” meaning “to drive back” or “to oppose.” English borrowed the form “react” in the late 16th century, and the related words “reaction,” “reactive,” and “reactor” developed from the same Latin base. The modern sense of responding to a stimulus grew from the earlier idea of a response or counteraction.
Related word forms
How reacted is actually used
In everyday use, “reacted” often suggests a visible or emotional response. In scientific contexts, it can describe a physical or chemical response. The third sense, meaning to oppose, is less common and usually appears in formal or political contexts.
Easily confused with reacted
“Acted” means performed or carried out an action, whereas “reacted” means responded to a stimulus, event, or situation.