reacting
反応している
解説 Definition
reacting は react（反応する）の現在分詞・動名詞です。人や物が出来事、言葉、変化などに対して反応している様子を表します。
Present participle and gerund form of react, describing the process of responding emotionally, physically, chemically, or operationally to an event, stimulus, statement, or change. It is commonly followed by to when the cause of the response is named.
覚え方のコツ Memory Tip
react に -ing をそのまま付けた現在分詞・動名詞で、原形の発音を保つ。re-「返して」＋act「行動する」から、刺激に対して行動や変化を返すイメージ。be reacting to＋音楽・ニュース・命令の形を基本にし、responding は意識的な応答にも使いやすい点と区別する。
Reacting is formed by adding -ing directly to react. Think of re- as movement “back” and act as “do”: when someone or something is reacting, it is giving an action or change back in response to a stimulus. Learn the core pattern be reacting to, as in reacting to music, news, or a command. Responding can suggest a deliberate answer, while reacting often emphasizes an immediate emotional, physical, chemical, or mechanical effect. The same base appears in reaction and reactive.
例文
The baby is reacting to the music.
赤ちゃんは音楽に反応しています。
People are reacting calmly to the news.
人々はそのニュースに落ち着いて反応しています。
The system is reacting slowly to each command.
そのシステムは各コマンドにゆっくり反応しています。
reacting の類義語・関連語
対義語
紛らわしい語
reacting の語源・成り立ち Etymology
reacting は re-「再び・返して」+ act「行う」+ -ing から成り、act はラテン語 agere「動かす・行う」に由来します。つまり「何かに対して、返すように行動する」が原義で、reaction や interact も同じ act 系なので、反応する意味に自然につながります。
Reacting is the -ing form of react. React was formed from re-, carrying the idea of “back” or “again,” and act, ultimately from Latin agere, meaning “to do, drive, or set in motion.” The word came to express acting back in response to an influence or stimulus. Adding -ing presents that response as ongoing or treats it as an activity. Reaction and reactive belong to the same modern word family.
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