interactions
相互作用
解説 Definition
interactions は interaction（相互作用、交流）の複数形です。人同士のやり取りや、物・仕組みが互いに影響し合うことを表します。
Interactions is the plural form of interaction. It refers to multiple occasions or processes in which people communicate with one another, or in which two or more things, forces, substances, or systems affect each other.
覚え方のコツ Memory Tip
interactions は inter-（間で）+ actions（行為）と分けると、「互いの間で起こる働きかけ」と覚えられます。expert（専門家）のように知識や技能を持つ人ではなく、人・物・要素が影響を及ぼし合う関係が中心です。social interactions（社会的相互作用）、interactions between drugs（薬同士の相互作用）のように使われます。
Break interactions into inter-, “between,” act, “do,” -ion, which forms a noun, and plural -s. The structure suggests actions or effects passing between participants rather than coming from only one side. Because interactions is plural, use it for several exchanges, encounters, or kinds of mutual influence. Social interactions are exchanges among people; interactions between sleep and stress are ways the two factors affect each other; drug interactions are combined effects involving medicines. Always connect the plural form back to singular interaction, and distinguish it from action, which does not by itself imply mutual influence.
例文
The teacher watched the students' interactions.
先生は生徒たちのやり取りを見守りました。
Small interactions can change the mood of a meeting.
小さなやり取りが会議の雰囲気を変えることがあります。
The study looked at interactions between sleep and stress.
その研究は睡眠とストレスの相互作用を調べました。
interactions の類義語・関連語
類義語
対義語
紛らわしい語
interactions の語源・成り立ち Etymology
ラテン語 inter-（間で）+ actio（行為）から成る。agere（行う）が語根で、action や agent と同族。「互いの間で行為し合う」が原義で、interactions は複数の主体や要素が影響を及ぼし合う相互作用を表す。接尾辞 -tion が名詞化を担う。
Interactions is the regular plural of interaction, formed by adding -s. Interaction combines inter-, from Latin for “between” or “among,” with action, ultimately from Latin actio, “a doing or act,” based on agere, “to do or drive.” The suffix -tion forms an action noun. The resulting word describes action or influence occurring between participants or elements. Its use now covers personal communication as well as mutual effects in science, medicine, technology, and social research.
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