foci
意味一覧 (2件)
焦点
解説 Definition
focusの複数形で、複数の焦点や中心点を指す。数学や医学で用いられる。
Foci is the plural form of focus. It means central points, main areas of attention, or places where something is concentrated. This plural form is especially common in scientific and academic writing.
覚え方のコツ Memory Tip
このエントリでは foci を「中心」一般ではなく、数学・医学・地震学などで使う専門的な「焦点」として覚える。focus のラテン語系複数形で、cactus→cacti のように -us が -i になる型。ellipse has two foci なら楕円の二つの焦点、foci of infection なら感染が集中している複数の病変部位を指す。
Think of it as the academic plural of "focus." Like cactus/cacti or nucleus/nuclei, the "-i" ending is a clue for a Latin plural. It often appears in technical contexts, such as geometry or medicine, where there is more than one focal point.
例文
The earthquake had multiple foci at different depths beneath the surface.
その地震は地表下の異なる深さに複数の震源を持っていた。
An ellipse is defined by its two foci, which determine its shape.
楕円はその形状を決定する二つの焦点によって定義される。
The study identified several foci of infection across the hospital ward.
その研究は病棟全体にわたる複数の感染の焦点を特定した。
中心
(意味 2)解説 Definition
foci は focus の複数形で、人々の関心・活動・議論などが集まる複数の中心を指す。都市の文化的中心、研究の重点領域、会議で注目されるテーマなど、抽象的な対象にも使われる。
Foci is the plural form of focus. It refers to several centers or main points where attention, activity, discussion, or interest is gathered. The word is often used for abstract things, such as the main areas of research, debate, or cultural life. In everyday English, focuses is also common, but foci appears more often in formal or academic writing.
覚え方のコツ Memory Tip
foci は focus のかたい複数形なので、まず focus を「注意や活動が集まる中心」と覚えると入りやすい。日常会話では focuses もよく使われるが、論文・報告書・政策文書では foci が出やすい。これは数学や医学の「焦点」という専門的な意味とは別に、main foci of debate のように複数の重点・中心を述べる語として読む。
Start by remembering focus as a center where attention or activity gathers. Then think of foci as the formal plural form of focus. In daily conversation, focuses is also common, but in papers, reports, and policy writing, foci often appears when several main points or centers are discussed.
例文
The main foci of the meeting were cost, safety, and customer service.
会議の主な中心は、費用、安全性、そして顧客サービスだった。
Tokyo has several cultural foci that attract artists and students.
東京には、芸術家や学生を引きつける文化の中心がいくつかある。
The report identifies the key foci of government policy for the next five years.
その報告書は、今後5年間の政府政策の重要な中心を示している。
foci の語源・成り立ち Etymology
foci は focus のラテン語複数形で、語源のラテン語 focus は「炉・かまど」を意味しました。家の中心に炉があることから「中心点」の感覚が生まれ、光や注意が集まる「焦点」という意味へ発展しました。関連語は focal、focus。
"Foci" is the Latin plural of "focus." In Latin, "focus" meant "hearth" or "fireplace," the central place in a home. From that idea of a center, the word later developed the sense of a central point where attention, light, or activity comes together. Related words include "focus" and "focal."
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