reactions
反応
解説 Definition
reactions は reaction（反応）の複数形です。人の意見や感情としての反応、または物事に対する変化や応答を複数まとめて表すときに使います。
Reactions is the plural of reaction. It refers to two or more emotional, verbal, physical, or other responses produced by an event, statement, substance, or change.
覚え方のコツ Memory Tip
reactions は reaction「反応」に複数語尾 -s を付けた形で、語末は /z/ と発音する。re-「返して」＋ act「行動する」＋ -ion「こと」という構造から、「働きかけに返される動き」と捉える。different reactions、students' reactions、strong reactions のように、複数の人や複数種の反応をまとめる場面で使う。
Start with the singular reaction, then add -s because more than one response is involved. The final -s is pronounced /z/: /riˈækʃənz/. Its structure also helps: re- suggests something directed back, act relates to doing, and -ion forms a noun, so a reaction is a response to an action or event. Use the plural when people respond differently or many responses are collected: their reactions, the students’ reactions, or strong reactions online. Compare response, which is broader and often more deliberate, with reaction, which can be immediate, emotional, physical, or chemical.
例文
Their reactions were very different.
彼らの反応は大きく異なっていました。
We watched the students' reactions carefully.
私たちは生徒たちの反応を注意深く見ました。
The news caused strong reactions online.
そのニュースはオンラインで強い反応を引き起こしました。
reactions の類義語・関連語
reactions の語源・成り立ち Etymology
ラテン語 re-（反対に）+ agere（行動する）から成る reactio が語源。「作用に対して返す行動」が原義。接尾辞 -tion で名詞化、-s で複数形。関連語: act（行動する）、agent（代理人）。
Reaction entered English through scientific and scholarly usage based on post-classical Latin reactio. It is built historically from re-, conveying movement back or in return, and the verbal base behind react, ultimately from Latin agere, “to do or drive,” plus the noun-forming element -ion. The central idea is an action produced in return for another action. Reactions adds the regular plural suffix -s to reaction.
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